Improvements in Machines for Carving Wood or other Materials.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Machines for Carving Wood or other Materials.
We ALFRED HUGH TYLER and JOHN STUART ELLIS DE VESIAN both of the
firm of Tyler & Ellis of 5 Crown Court in the City of London Engineers do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:-
This invention has for its object to provide a machine for carving one or any
desired number of articles of wood or other material from a template or pattern,
which machine is very compact, economical in construction and readily manipulated,
and in which the driving bands or guts are arranged so as to be out of the way of
the manipulator of the machine.
The carving tools and the means for driving them and also the tracing point or
stylus are carried on a frame pivoted or centred at its lower end in brackets situated
below the level of the bench or table on which the articles to be carved are placed,
the centre of oscillation of this frame being coincident or in line with the axis of the
shaft from which the carving tools receive their rotary motion. The upper end of
this oscillating frame extends above the bench or table and mounted by pivots
thereon is a rod or bar (which we will term the back bar) having thereon near each
of its opposite ends a collar to which collars are pivoted rings each carrying an arm
extending over and towards the front of the table where they carry a bar (which
we will call the "front bar") which carries the tracing point or stylus and the
brackets in which the spindles carrying the carving tools rotate. The said brackets
are secured to the front bar so that they project from the rearward side thereof
and therefore the said tools and tracing point and the bands or guts which drive the
tools are situated at the back of the said front bar and are out of the way of the
operator of the machine.
The carving tools are rotated by means of bands or guts the various driving and
guiding pulleys being so situated with reference to the axes on which the moving
parts turn that the driving guts or bands remain tant (in whatever direction the bar
carrying the carving tools may be moved) without the employment of weights or
springs for taking up slack and the parts are o balanced that the tools may be
made to bear on the work with a great nicety of pressure and be operated without
undue exertion on the part of the operator. The front bar is carried in such a way
that it can be adjusted and fixed axially to give the tools a rake in either direction
for causing them to undercut.
Figure 1 of the accompanying drawings is a front elevation, Figure 2 a plan and
Figure 3 an end view of a carving machine constructed according to our invention.
A is a bench or table on which are fixed by any suitable means the template or pattern
to be copied and the block or blocks of material to be carved. In the drawings we
have shewn three blocks of material C to be carved from one template or pattern B
but if desired more than three blocks may be simultaneously operated on or if only
one or two copies of the pattern be required only one or two blocks of material will
accordingly be fixed in position on the table. At the back or rear of the table A
and pivoted below the surface thereof is a frame D the axis of oscillation of which
is coincident, or in line, with the axis of the driving shaft E from which the carving
tools receive their rotary motions.
This frame D is weighted at D' below the axis of oscillation so as to counter-
balance the weight of the parts carried by the frame as hereinafter described.
Pivoted to the upper end of the frame D is another frame consisting of the back
bar Farms G and the front bar H.
The back bar F, which is pivoted at ff to the frame D, is provided with discs or

page_text: collars to which are pivoted rings I carrying the arms G which extend over and
towards the front of the table A and are pivoted at their front ends to sockets K
clamped onto the front bar H. Extending from the rear of the rings I are arms G²
provided with weights L to counterbalance the weight of the arms G and parts
carried thereby so that the back bar with the arins G and front bar H may be
readily and easily turned or oscillated on the pivots f to raise and lower the front
bar as required. To the front bar H are clamped brackets M in which are mounted
spindles N to which the carving tools O are fixed on which front bar is also clamped
a socket P carrying the stylus or tracing point Q. The arms G are mounted so as
to oscillate side ways on the pivots g² and the bar H being pivoted to the front
ends of the arms G the said bar H is capable of being moved longitudinally and
parallel to the back bar F and also of being raised and lowered, as required by
oscillating or turning the bar F on the pivots fit may also be moved to and fro
across the table by oscillating the frame D on its pivots df. It will thus be seen
that the stylus Q and carving tools O are capable of being moved in any direction
required by the pattern or template whilst the moving parts are so counterbalanced
by the weights D² and L that no undue exertion on the part of the operator is
required to work the machine. The carving tools O are rotated at a high speed
from the driving shaft E on which is keyed a grooved pulley R carrying a driving
band or gut S which is conducted by guide pulley T on the frame D to a pulley U
mounted on a bracket V clamped on the back bar F.
From the pulley U passes another band or gut W to a pulley X of smaller
diameter fast on a spindle Y mounted in a bracket Z clamped on the front bar H.
Fast on the spindle Y is a grooved pulley Y2 or grooved pulleys carrying endless
bands or guts which pass round pulleys of smaller diameter fast on the spindles N
which carry the carving tools so that by this system of driving bands and pulleys
the carving tools are driven at a high speed whilst the arrangement of the driving
guts also permit of the front bar or rod with the stylus and carving tools being
moved in any direction required without causing the said bands or guts to
slacken.
The necessary rake or angle may be given to the carving tools and stylus to
effect under cutting by adjusting the front rod or bar H axially in the sockets K
the angle of the bracket V on the back bar F being correspondingly adjusted so as
to maintain the driving band or gut W taut.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The combination and arrangement of parts constituting the improved machine
for carving wood or other material substantially as hereinbefore described and
illustrated by the accompanying drawings.
2. The arrangement of driving guts or cords, or the like, and pulleys, mounted
as, and for the purpose, herein before described and shewn in the accompanying
drawings.
Dated this 20th day of June 1809
J. H. JOHNSON & Co.,
Agents.