Improvements in Mechanism for the Cutting of Wood Shavings.
Year: 1888

page_text: Date of Application, 24th Aug., 1888
Complete Specification Left, 14th May, 1889-Accepted, 22nd June, 1889
PROVISIONAL SPECIFICATION.
Improvements in Mechanism for the Cutting of Wood Shavings.
I JOHN SCOTT DUNN of 10 Windsor Terrace, Glasgow, Lanarkshire, Timber
Merchant, do hereby declare the nature of my invention to be as follows:-
This Invention has reference to and comprises certain improvements in mechanism
for the cutting or splitting of the broad wood shavings which come from planing
machines, as a waste or bye product, heretofore only used as fuel,-into narrow
strips of fibrous or straw like character suitable for making packing for general
purposes, the object of the invention being the more valuable utilization of this waste
material from wood working machinery.
The nature and novelty of my invention consist all as follows:-First, under one
modification, suitable for being fitted under the lower fixed planing irons or knives of
planing machines such as those used for the making of flooring boards, which deliver
the shavings directly downwards, 1 erect on a separate or portable frame under the
said planing machine either secured to the floor below the machine or to the side
framing of the machine one, or it might be two spindles, with cutting steel discs of
the width I desire the shavings, and with washers between thein of a corresponding
width, all screwed in the centre part of the spindle up against a large collar at one
end of the spindle, and washer and nut at the other end, to grip them all up tight on
the central turned body part of their spindle, the washers between the cutting discs
being considerably less in diameter than the cutting discs. The cutting discs of the
one spindle rotate alternately between the cutting discs of the other, overlapping each
other slightly at the contre, so that both edges of the two sets of discs cut the broad
shavings as they are fed down in between them, from the planing machine, into
narrow strips of the width of the cutting discs, which may be from a quarter to one
tenth of an inch or so in thickness across their face, the narrow strips as cut from the
broad shavings passing down through between the knives of the one set of discs and
the washers between the cutting discs of the other set. Spur wheels would be mounted
on the one end of the spindles of these cutting discs, so as to turn both sets of discs in
towards each other at the centre, and so drag in and cut the shavings fed to them
above; and one of the spindles would have a band pulley or gearing on it at the other
end, driven from any of the other spindles of the machine, so as to turn in the said
direction at a speed proportionate to the speed of the shavings delivered from the planing
machine, and take them away and cut them as fast as they were produced. A sheet iron
or other hopper would be mounted over these sets of cutting discs or rolls of dises to direct
the shavings down towards these, in their broad flat direction as delivered from the three
or more plane cuiters of the planing machine. To ensure the delivery of the narrow
cut strips down from between the cutting discs, I erect combs, preferably cut out of
sheet steel, fitted up between the cutting knives, and working with sharp edges at a
tangent on the circumference of the separating discs between the cutting discs, so as
to clear the narrow shavings out of these and deliver them on to a travelling web or
belt which would remove them to one side of the machine. Instead of using two
rollers of such sets of cutting discs, I might use one such roller, rotating in between a
cutting comb or blades secured to or formed out of an angled plate directing the broad
shavings down towards the cutting discs and comb blades. In some cases very fine
teeth might be formed on the face of the cutting discs to assist in drawing and feeding
in the broad shavings to be cut or split. Or when the shavings were desired to be
split into still narrower strips, the cutting discs might be made in the form of sharp
cutting disces and cut into grooves in the opposite roller, which might have wood or
india-rubber rings fitted in the grooves for the sharp knives to work up against and
cut the shavings. Instead of the comb plates for cleaning the shavings from the

page_text: cutting rollers, rotating spindles might be mounted below the cutting disc rollers with
clearing discs having teeth or fingers on them for removing the material from between
the cutting knives, and delivering it down between the clearing rollers.
Instead of fitting this arrangement of cutting mechanism below the planes of
planing machines, it might be mounted on standard side frames of its own as a
separate machine, and have the shavings fed into it over an angled feeding table or it
might be a travelling band table, which would feed the shavings regularly and properly
into the cutting knives approximately in their broad shape to be cut into the narrow
strips, all as described in reference to the mechanism fitted direct to the planing
machines.
Dated this 94th day of Anant 7000
COMPLETE SPECIFICATION.
Improvements in Mechanism for the Cutting of Wood Shavings.
I, JOHN SCOTT DUNN, of 10 Windsor Terrace, Glasgow, Lanarkshire, Timber
Merchant, do hereby declare the nature of my said invention and in what manner the
same is to be performed to be particularly described and ascertained in, and by the
following statement in writing, reference being had to the accompanying Sheet of
Drawings, and to the letters and figures marked thereon, that is to say :-
This Invention has reference to and comprises certain improvements in mechanism
for the cutting or splitting of the broad wood shavings which come from planing
machines, as a waste or byo product, heretofore only used as fuel, into narrow
strips of fibrous or straw like character suitable for making packing for general
purposes, the object of the invention being the more valuable utilization of this waste
material from wood working machinery.
And in order that my said invention and the manner of performing or carrying the
same into effect or practico may be properly understood, I have hereunto appended an
explanatory Sheet of Drawings in which the same reference letters are used to indicate
corresponding parts in all the Figures where shown. Figure 1 is a side sectional
elevation of the new or improved mechanism for the cutting or splitting of wood
shavings as fitted to or below a wood planing machine and with the one set of cutters a¹
and spindle A¹, removed. And Figure 2 is a transverse sectional elevation as taken on
the irregular line 1 - - - 1 of Figure 1. While Figures 3 and 4 are a side sectional
elevation and transverse section respectively showing the new cutters a a² and
combs C, c, and their fittings, and mode of constructing same, to an enlarged scale
from that shown in Figures 1 and 2.
Referring to these Drawings, the nature and novelty of my invention consist all as
follows: First, under one modification suitable for being fitted under the lower fixed
planing irons or knives at K of planing machines such as those used for the making
of flooring boards K' as shown in Figures 1 and 2, which deliver the shavings directly
downwards below the knives K, generally in an angular or twisting manner, 1 erect
in bush bearing plummer blocks B, B, on a separate or portable frame B', B₁, under
the said planing machine either secured to the floor below the machine, or to the side
framing of the planing machine and preferably at right angles to it to suit the
twisting shavings, two parallel spindles A. A', with cutting steel discs a, a¹ of a thick-
ness equal to the width I desire the strips of shavings to be cut, and with washers bb',
between them of a corresponding width or thickness, all screwed in the centre part of
the spindles A A', up against a large collar A at one end of the spindles, and washer
and nut A2, A3, at the other end, to grip them all up tight on the central turned body
part of their spindles A A', the washers bb between the cutting discs a, a¹ being
considerably less in diameter than the cutting discs and adjusted by discs of paper
between them. The cutting discs a of the one spindle A rotate alternately between
the cutting discs a' of the other A', overlapping each other slightly at their tangential

page_text: centre, where they run towards each other on the upper surface, as shown by the
arrows in Figures 2 and 4, so that both edges of the two sets of discs a, a', cut the
broad shavings as they are fed down tangentially in between them, from the planing
machine, into narrow strips of the width of the cutting discs, which may be from a
quarter to one tenth of an inch or so in width across their face, the narrow strips as
cut from the broad shavings passing tangentially down through alternately between
the knives of the one set of discs a and the washers between the cutting discs a' of
the other set and between the cutting knives a', and the washers of the opposite set
of cutting discs a. Spur wheels D D₁, are mounted on the one end of both
spindles A A', of these cutting discs a a', so as to turn both sets of discs in towards
each other at the centre on the upperside, and so drag in and cut the shavings fed to
them above as indicated by the dotted lines at k. And one of the spindles A, would
be actuated by mitre or bevel wheels F E, at the other end from a longitudinal
spindle carried in bush bearing pillow blocks at on the lower part of the
framing L actuated by a pulley and belt FF", driven from any of the other spindles
of the machine, so as to turn in the said direction at a speed proportionate to the speed
of the shavings delivered from the planing machine, and take them away and cut them
as fast as they were produced, or this driving pulley 2 might in some cases be mounted
on one of the spindles A or A' when that was convenient, as when the spindles A. A¹
were mounted at right angles to the framing L or at an angle thereto as they might
be to suit the direction the shavings were fed to their cutting dises a u¹. A sheet iron
or other hopper H is mounted over these sets of cutting discs or rolls of discs a a¹ to
direct the shavings down towards these, in their broad flat direction as delivered from
the three or more plane cutters at K of the planing machine. To ensure the delivery
of the narrow cut strips down from between the cutting discs a al, I erect combs e c',
one of which is shown detached in side and edge view in Figure 5, preferably cut out
of sheet steel, fitted up between the cutting knives a a, and a¹ a', respectively, over
the washers preferably having their upper ends made in the form of knee hooks
at to take over locking bars 3 on the main cross bars H'H' carrying the hopper H
over the sets of cutting discs a, a', held in position by the outer side plates c, which
can be removed to take out any of these combs or insert new ones. The lower ends
of these combs ce pass down through and widen out at to clear the shavings out
of and allow them to pass down freely from the cutting rollors A a and A¹ a', as
indicated by the darts Figures 2 and 4, and fitted with plates d d', below these cutting
rollers to prevent the cut shavings from being taken up or getting entanged with the
knives a a', below which an angled delivery plate or board is preferably fitted at d² to
deliver the cut shavings out at one side of the machine. Instead of the angled
delivery plate da travelling web or belt might be used which would remove the
shavings to one side of the machine, or to any part desired at a distance from the
machine. Instead of the combs ce passing up over the rollers A A' and washers bb
fixed above to the bars c³ and EL', these couibs might be mounted as dotted in at c¹ to
work with their upper sharp edges at an angle on the underside to clear the cut
shavings out from between the knives and deliver them down below otherwiso
substantially as described and indicated by the darts in Figures 2 and 4. Instead of
using two rollers of such sets of cutting discs a a', I might use one such roller,
rotating in between a cutting comb or blades secured to or formed out of an angled
plate, directing the broad shavings down towards the cutting discs and comb blades.
In some cases very fine teeth might be formed on the face of the cutting discs a a¹, to
assist in drawing and feeding in the broad shavings to be cut or split. Or when the
shavings were desired to be split into still narrower strips, the cutting discs might be
made in the form of sharp cutting discs and cut into grooves in the opposite roller,
which might have wood or india-rubber rings fitted in the grooves for the sharp
knives to work up against and cut the shavings. Instead of the combs e c', or cl, for
cleaning the shavings from the cutting rollers, rotating spindles might be mounted
below the cutting disc rollers with clearing discs having teeth or fingers on them for
removing the material from between the cutting knives, and delivering it down
between the clearing rollers as dotted in at c.
C

page_text: Instead of fitting this for cutting shavings into narrow strips under the planes of
planing machines, it might be mounted on standard side frames of its own as a separate
machine, and have the shavings fed into it over an angled feeding table, or it might
be a travelling band table, which would feed the shavings regularly and properly into
the cutting knives approximately in their broad shape to be cut into the narrow strips,
all otherwise as described in reference to the mechanism fitted direct to the planing
machines.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
First. The construction, or arrangement and combination of the parts of cutting
discs, combs, and their fittings, either applied to wood planing machines, or used as a
separate machine, for the cutting or splitting of wood shavings into narrow strips,
substantially as and for the purposes herein described, in reference to and shown in
the accompanying Drawings.
Second. In mechanism for the cutting of wood shavings into narrow strips, the use
of duplex sets of cutting metal discs mounted on parallel spindles, the discs of the one
spindle rotating alternately between the discs of the other, substantially as and in the
manner herein described, in reference to and shown in the accompanying Drawings.
Third. In mechanism for the cutting of wood shavings into narrow strips the
combination of cutting discs a a¹ with narrow guide or delivery combs c, c¹, or cl
between them or their equivalent delivery comb wheels c, substantially as herein
described in reference to and shown in the accompanying Drawings.
Fourth. In mechanism for the cutting of wood shavings into narrow strips, the
cutting discs, and combs in combination with a guide hopper, or it might be equivalent
angled table or travelling band, substantially as herein described, in referenco to and
shown in the accompanying Drawings.
Fifth. In disc cutting mechanism for the cutting of wood shavings into narrow
strips, the construction and use of combs e el c¹¹, for the clearing out and delivery of the
narrow strips from between the cutters, substantially as herein described in reference
to and shown in the accompanying Drawings.
Dated this 14th day of May 1889
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.