Improvements in Carving Machines.
Year: 1891

page_text: Date of Application, 12th May, 1891-Accepted, 11th July, 1891
COMT DIE SUITATION.
Improvements in Carving Machines.
A communication from THE MILWAUKEE CARVING COMPANY, of Milwaukee
State of Wisconsin, United States of America.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:-
The main object of the invention is to produce or duplicate carvings from a
pattern or model by tracing the pattern or model with a guiding tool or follower,
which causes a like or similar movement of a cutting tool or tools, and to that end
to relieve the carriage of belt pull, and shake or vibration in transmitting power
to the cutting tool or tools.
It consists essentially of certain peculiarities of construction and arrangement
of the tool supporting and guiding mechanism, of the cutting tool driving
mechanism, of the support for holding the work and pattern or model, etc.
In the accompanying drawing like letters designate the same parts in the several
figures.
Figure 1 is a perspective view of the improved machine;
Fig. 2 is a plan view on an enlarged scale of the pulley yoke from which the tool
carriage is suspended;
Fig. 3 is a similar view of the tool carriage;
Fig. 4 is a cross section of the pulley yoke through one of the pulley brackets,
and
Fig. 5 is a detail in perspective of a modified form of the tool carriage and of
the cutting tool driving mechanism, and
Fig. 6 is a perspective view of a machine containing a modified form of the
cutting tool driving mechanism, and
Fig. 7 is a plan view of the pulley yokes and their connections in said modified
machine.
A represents the frame of the machine which supports the work table. It is
formed with longitudinal ways a a, for the lower longitudinally sliding section B
of the work table, which is provided on its upper face with transverse ways bb. for
the upper transversely sliding section C of the work table.
Dis a rigid rectangular frame supported at each side and arranged to oscillate
on the ends of cone pointed screws in the hangers N N or other suitable
supports. Between projecting arms or ears at the front end of the frame D is
supported the pulley yoke on the ends of cone pointed screws d d in a line
parallel with the axis on which said frame D oscillates. At each end of said yoke,
in lines intersecting its axis of oscillation at right angles, are pivoted between
cone pointed screws ff the upper ends of the depending vibratory arms FF.
G is the tool carriage made in the form of an open, elongated quadrangle, and
provided at the centre of each end with projections which are pivoted in lines at
right angles thereto between the lower bifurcated ends of the arms F F on conc
pointed screws ff.
HH' are tool holders cruciform in shape as shown most clearly in Figs. 3 and 5.
The horizontal limbs of said tool holders are swiveled at the ends between the
sides of the carriage G on cone pointed screws gg in lines intersecting the axis of
said carriage at right angles. The horizontal limbs of said tool holders are
provided with upwardly projecting arms hh, which are connected by a horizontal
rod ' so that any lateral inclination of one tool holder upon the pivot bolts will
produce a like inclination of the other tool holders. Each of the upright limbs of

page_text: said tool holders is provided at the lower end with jaws or fastenings for securing
the guiding and. cutting tools therein. To the pulley yoke E, just inside of the
arms, are swiveled on studs or screws e¹, as shown in Figs. 2 and 4, the rear-
wardly projecting, bifurcated pulley brackets e.
00 are upright driving shafts journaled at their upper ends in the brackets e
and provided between the limbs of said brackets with grooved. pulleys o, and
journaled at their lower ends in the upright limbs of the cutting tool holders H so
as to conform to the angular movement of the carriage supporting arms F F.
The driving shafts OO are formed or provided at their lower ends in said tool
holders with jaws, chucks or other suitable fastenings (not shown), by means of
which the cutting tools are secured thereto. The rear side of the pulley yoke E
inside of the rear pivot screws is made open and each of the pulleys o o is con-
nected by a belt with a suitable driving pulley (not shown) at or near the rear end
of the oscillating frame D.
The rearwardly projecting portion of frame D is provided with adjustable
counterweights D₁ D', by means of which the front end of said frame and the tool
carriage, with its connections suspended therefrom, are counterbalanced.
Referring to Fig. 5, 0¹ represents a modified form of the driving shaft, bearing
at its upper end like the shafts O in a swiveled bracket e, but provided at its lower
end just above the tool holder H with a flexible section 02. The rigid upper
portion of the shaft O' is enclosed in a rigid tubular sheath P. The lower flexible
portion of said driving shaft is enclosed in a flexible sheathing p' attached at its
lower end to the tool holder H and at its upper end to the sheath P, which at that
point is provided with a bearing for the lower end of the rigid portion of said
driving shaft. The tool carriage G¹ is formed at the middle of each end in the
line of its axis with trunnions g, which bear in sleeves g² pivoted at right angles to
said trunnions on cone pointed screws between the lower bifurcated ends of the
vibratory arms F. This construction permits of the oscillation of the carriage G¹
upon its axis and the inclination of the tools in any direction for the purpose of
undercutting.
My improved machine operates as follows:
The pattern or model and the blanks to be carved are firmly secured to the
upper section C of the work table, the blanks on each side of the model or pattern
in proper position to be operated upon by the cutting tools. The work is then
moved into convenient position to be operated upon and the cutting tools rapidly
rotated. The surface of the pattern is traced by the guiding tool which produces
a like and simultaneous movement of both the cutting tools. The vibratory arms
swinging backward 'and forward on the pivot bolts d'd and sidewise on the pivot
bolts allow the carriage G to be moved freely in any lateral or horizontal
direction and the frame D oscillating on a horizontal axis in the line of the pivot
bolts n n permit of the free vertical movement of the tool carriage. A slight
undercut can be made by swinging the carriage laterally or endwise so as to carry
the driving shafts OO and the cutting tools in line therewith away from a perpen-
dicular in any desired direction and by moving the work supporting table in a
corresponding direction into proper position to be operated upon by the cutting
tools.
By the employment of driving shafts having flexible sections, like that shown in
Fig. 5, more abrupt undercuts can be made without moving the upper rigid portions
of the driving shafts and the carriage supporting arms Fout of perpendicular
positions or moving the work correspondingly.
Referring to Figs. 6 and 7, illustrating a machine containing a modified form of
driving mechanism, I represents a pulley yoke supported at the ends on cone
pointed screws ii in uprights A' A¹ rising from the frame of the machine, so as to
oscillate on a horizontal axis. To this yoke at or near its ends are pivoted on cone
pointed screws 1, in lines intersecting its axis of oscillation at right angles, the
bifurcated rear ends of vibratory arms L L.
A little inside of the pivot bolts and parallel therewith are journaled in

page_text: said yoke I shafts each provided with a larger and a smaller pulley I' and 12. In
the front bifurcated ends of the arms L L are pivoted, in lines parallel with the
axes of screws, recessed swivel blocks R R on cone pointed screws PP.
K is a yoke formed at the ends with rearwardly projecting offsets which are
pivoted in the swivel blocks R R on cone pointed screws rr, in a line parallel with
the axis of oscillation of yoke I. To the rear side of the yoke K are pivoted the
bracket bearings on studs or screws k', as shown in Fig. 7.
The rigid cutting tool driving shafts OO bear at their lower ends in the tool
holders H H, as previously described; but at their upper ends they are supported
and bear in the brackets kk, which are bifurcated to receive the pulleys oo fixed
on said shafts and centered in the axis of oscillation of the yoke K so that the pull
of the driving belts will be exerted directly through the pivot screws and
on the arms L L in the direction of their length.
The yoke K, being movable independently of the tool carriage and its guiding
mechanism, permits the inclination to the tool carriage of the shafts OO and the
cutting tools without moving the tool carriage or its guiding mechanism for that
purpose. In this manner undercutting may be done without employing the upper
transversely sliding section C of the work table, shown in Fig. 2, a simple
longitudinally sliding table B1 being used.
The arms F F are bent outwardly adjacent to the ends of yoke K to permit of
a greater vibration laterally of the arms L L, and the rigid oscillatory frame D is
supported at each side on cone pointed screws d'd in the upper ends of the
standards A¹ A', otherwise the tool carriage guiding and supporting mechanism. is
essentially like that described in connection with Fig. 1.
With the form of driving mechanism last described, the frame D may be
suspended in an upright position and the arms F1 F1, connecting the tool carriage
therewith, may be placed in a horizontal position so that the driving mechanism
and the carriage guiding mechanism will be separated and cannot interfere with
each other in their independent movements.
It will be observed that in the driving mechanism, described in connection with
the main construction and several modifications, the rigid tool driving shafts are
extended upwardly from the tool carriage and have bearings and pulleys at their
upper ends apart from and independent of the tool carriage, so that the belt pull
instead of being exerted upon the tool carriage is received either by the frame D
or the arms L L.
Any vibration, shake or movement of the tool carriage by the driving belts. is
thus avoided and the carriage is left free to respond more readily to the force
exerted by the operator in moving it:
.
In place of the arms / h.and connecting rod ', a rigid spindle may be attached
to the guiding tool holder, extended upwardly parallel with the shafts O O and
jointed to the yoke E or yoke K by means of a bracket similar to brackets e or k;
or by any other suitable connection. By this means the inclination of either tool
will cause a like inclination of the others.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondents, and in what manner the
same is to be performed, I declare that what I claim is :-
1. In a carving machine, the combination with a frame supported in a horizontal
position in suitable bearings and capable of oscillation on a horizontal axis, a tool
carriage provided with a guiding and a cutting tool suspended from said frame by
vibratory arms having jointed connections therewith and a counterweight or
counterweights attached to said frame on the opposite side of its axis of oscillation,
substantially as and for the purposes set forth.
2. In a carving machine, the combination with a rigid frame supported in a
horizontal position on suitable bearings and capable of oscillation on a horizontal
axis, a pulley yoke carried by said frame and capable of oscillation on a parallel
axis, a tool carriage provided with a guiding and a cutting tool and tool holders

page_text: having jointed connections therewith, vibratory arms having jointed connections
with said pulley yoke and tool carriage in lines at right angles with the axes
thereof, a bracket bearing swiveled to said pulley yoke and a rigid driving shaft
journaled at its upper end in said bracket and at its lower end in the cutting tool
holder, substantially as and for the purposes set forth.
3. In a carving machine, the combination with a rigid horizontal frame capable
of oscillation on a horizontal axis, a yoke carried by said frame and capable of
oscillation on a parallel axis, depending vibratory arms having jointed connections
at their upper ends with said yoke in lines at right angles to its axis, a tool carriage
supported by and having jointed connections with the lower ends of said arms, tool
holders having jointed connections with said carriage in lines at right angles to its
axis, bracket bearings swiveled to said yoke, upright driving shafts journaled at
their upper ends in said brackets and provided with pulleys and journaled at their
lower ends in the cutting tool holders and a belt or belts connecting said pulleys
with a suitable driving pulley or pulleys, substantially as and for the purposes set
forth.
4. In a carving machine, the combination with a rigid frame capable of oscillation
on a horizontal axis, an oscillatory yoke having pivotal connections with said frame
in a line parallel to its axis, a tool carriage connected with said yoke by depending
vibratory arms and constituting therewith a jointed parallelogram, connected
guiding and cutting tool holders having jointed connections with said carriage, a
bracket swiveled to said yoke, a rigid driving shaft provided at its upper end with
a pulley and journaled in said bracket and in the cutting tool holder, and a work
table composed of two sliding sections movable at right angles to each other,
substantially as and for the purposes set forth.
5. In a carving machine, the combination with a movable tool carriage provided
with a guiding and a rotary cutting tool, of guiding mechanism connecting said
carriage with a suitable support, a rigid driving shaft connected with said rotary
cutting tool and extending upwardly therefrom and provided at or near its upper
end with a pulley, a movable jointed bearing for said shaft near said pulley capable
of receiving the belt pull and preventing its transmission to the tool carriage and a
belt connecting said pulley with a driving pulley, substantially as and for the
purposes set forth.
6. In a carving machine, the combination with a movable tool carriage, provided
with a guiding and a rotary cutting tool, of a rigid shaft connected with said rotary
cutting tool and provided with a pulley, a movable jointed bearing independent of
said carriage, supporting said shaft near its pulley so as to receive the belt pull,
and a belt connecting said pulley with a driving pulley, substantially as and for the
purposes set forth.
7. The combination in a carving machine with rocking rods having weights at
their rear ends, of vertical rods articulated at their upper ends to said rocking rods,
a head having apertures for the passage of the carving devices and connected with
said vertical rods by universal joints, substantially as and for the purposes set
forth.
8. In a carving machine the combination with an apertured head, a spindle
carrier pivoted therein and a hand-picce connected with said spindle carrier, of
vertical rods suspending said head and connected therewith by universal joints,
horizontal rocking rods to the front ends of which said vertical rods are articulated,
and weights at the rear ends of said rocking rods, substantially as and for the
purposes set forth.