Improvements in or relating to Mitering or Trimming Machines.
Year: 1893

page_text: Date of Application, 21st Apr., 1893-Accepted, 15th July, 1893
COMPLETE SPECIFICATION.
Improvements in or relating to Mitering or Trimming Machines.
A communication by JOSEPH WHIPPLE OLIVER, of 36, Eighth Street, Grand
Rapids, in the County of Kent and State of Michigan, United States of
America, Travelling Salesman.
I, WILLIAM PHILLIPS THOMPSON F.C.S. M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool, and 6, Bank Street,
Manchester, both in the County of Lancaster, and 323 High Holborn, in the
County of Middlesex, Civil Engineer, 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 object of this invention is to produce a trimming machine in which the parts
to form a joint of any angle may be accurately cut. In order to produce this result
it is necessary to have the parts which operate as holding parts arranged to be set
and accurately held at a desired angle, and to have the knife or cutting part
accurately moved to cut or shave off the article under operation.
Another object of the invention is to produce a trimming machine in which the
upper surface of the main bed-plate or table on which the work is to rest is entirely
unobstructed on all sides of the gauges, thus enabling the gauges to be set through
the widest possible range.
And still another object is to so support the upper side of the frame of the
trimming knife, by supports that pass in front of the frame without interfering with
it, that the knife can pass endwise through a greater range than is usual in this
class of machines.
This invention enables these results to be secured, and other results which will be
more fully pointed out in describing its operation.
In the drawings :—
Figure 1 shows a perspective of a machine embodying this invention.
Figures 2, 3, 4 and 5 are details respectively, of which—
Figure 2 is a plan view of the movable gauge.
Figure 3 is a plan view of the bottom clamp.
Figure 4 is a section of the movable gauge and clamp, the section being
through a x of Figure 2.
Figure 5 shows, in section, the means of turning the bed-plate on the supporting
post.
Figure 6 is a front elevation.
Figure 7 shows a side view of the gauge and the means of attaching the adjustable
supporting face-plate thereto.
Figure 8 shows an end view showing the table, gauge, sliding knife and means of
supporting the upper way in which the knife frame slides.
A, represents a standard, on the top of which rests a table B, the two being
connected by means of a swivel or turning pin in any well known way, such that
the table may turn in a horizontal plane on the top of the standard. One easy way
of effecting this is to make the standard A cylindrical with a cross bar or plate a
placed across near the top of the cylinder. The bed-plate B rests on the top of the
cylinder, and is provided with a downwardly extending rib 6 that fits upon and is
adapted to turn on the cylinder A. The threaded screw A', provided with a hand
wheel, passes through an opening in the plate a, and is screwed into the bed-
plate B; this permits the bed-plate B to be moved in a horizontal plane through
the complete circle, and to be clamped, at any part of its motion, by means of the
screw and hand wheel A'.
The bed-plate B carries two angle-gauges C and C₁, and supports also a frame

page_text: within which slides a knife holding frame D, provided with means for holding the
two knives & d', one of said knives being oblique to the right and the other to
the left; there is also supported by the bed-plate B a journal J, upon which turns
a pinion ; adapted to mesh in the rack J' that is attached to the knife frame D.
Upon the hub of the pinion is placed an arm K, by means of which the pinion j
may be turned on its arbour, and tho raak J' moved to one side or the other of the
bed-plate. In moving across the bed-plate, the rack J' carries with it the knife-
frame D and the knives d, d².
The rack J' is located below the lower end of the cutting knives, and its teeth
project downward and are partially covered in or walled in so as to present no
upturned opening within which dirt or chips can collect and prevent the easy
working of the movable parts. The location of the rack below the cutting knives
allows the ends of the knives to be placed much nearer together, and thereby
shortens the machine.
The knife-frame D is reciprocated across the cutter in front of the bed-plate B
in ways, one of which, shown at E in Figure 8, is at the underside of the knife
frame, and the other, shown at f in the same figure, is above the knife-frame D.
The lower way E is formed on a ledge or step that is bolted or otherwise secured
to the bed-plate B, in front of it and below its upper surface. The upper way fis
supported on arms or brackets E', that are attached to the bed-plate B and extend
forward and upward entirely out of the way of the knife-frame D. These brackets
or arms E' may be made in one piece with or separate from the lower way E. The
carriage part of the knife-frame that rides on the way E is made integral with
the rack J, and reciprocates in front of the bed-plate B, in close contact with the
forward vertical side thereof. The method of supporting the knife-frame at its
top and bottom edges only, while forming a firm unyielding support to the knife,
presents no obstruction of any kind to its reciprocating movement, and the close
contact between the carriage part of the knife frame prevents chips or dirt from
gathering and remaining on the carriage-way, as any chips or other matter that
happen to fall on the carriage-way are pushed in front of the riding part of the
carriage out of the way.
The arms E' also support two guide-plates G, one located at each end of the
upper track f, and, while these in no-wise interfere with the motion of the knife-
frame D, they serve to prevent any one from accidentally striking the sharp edge
of the cutting knives d, d', at times when these cutting knives have been moved
so that one of them extends out beyond the arms E¹, and would be otherwise
unprotected.
On the upper side of the bed-plate B are two angle-gauges, duplicates of one
another, except that one is a right hand and the other is a left hand gauge. Each
gauge consists of a wedge shaped piece having a flat under surface adapted to
rest on the upper surface of the bed-plate; a smooth inner surface c, at right
angles to the first mentioned surface. The under side of the gauge C has in it an
annular groove having a radius equal to its distance from the edge of the wedge;
within the annular groove is received the upper part of the annular clamp 1 ; this
clamp 1 is formed as a part of a ring made with two coned surfaces, a cross section
showing, as appears in Figure 4, in the form of an inverted V, not coming to a
point, however, but finished with a rectangular extension of the same shape as the
cross section of slot in the underside of the gauge C. The bed-plate B is provided
with a groove, nearly a semi-circle in extent, having the same radius of curvature
as the clamped piece 1, and having the same shape in cross section as that shown
in the V part of the cross section of the clamp 1. The clamp piece 1 is provided
with an upwardly extending stem piece, threaded at its upper end and fastened to
it at its lower end in any appropriate way. The stem pieee L, when the parts are
assembled, extends upward through a hole in the body of the gauge C, and receives
at its upper end a nut M, provided with a handle m. The combined conical and
curved form of the clamping piece 1 and the slot S compels the gauge to always
assume exactly the same position when clamped at a given spot, and, as both the

page_text: slot and the clamp are tooled accurately in the arc of a circle struck from the
edge g, as a centre, the wedge is always compelled to assume a position with its
forward or wedge edge exactly at the centre of the circular slot S. An adjustable
face-plate P permits of adjusting the forward edge g, which extends from bed-
plate B to a point higher than the knife frame D and presents an obstructed
surface from top to bottom of said gauge, accurately in the first instance, and of
re-adjusting, should the thin edge be worn in use.
The means of attaching the adjustable supporting face-plate to the gauge will
be better understood by referring to Figures 2 and 7. At the front or pointed end
of the gauge C are two or more oval slots, through which pass short bolts or screws
entering the face-plate P and securing the plate to the angle gauge.
The screws
are capable of movement within the limits of the oval slot, and the face-plate can
be set forward or back correspondingly.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. In a trimming machine, the combination of a bed-plate, a trimming knife
adapted to move along the edge of said bed-plate, upper and lower guides for the
trimming knife, guide supporting arms extending forward from below the upper
surface of the bed-plate beyond the knife frame, thence upward to the upper
guide, whereby the upper surface of the bed-plate is unobstructed on all sides of
the gauges, substantially as and for the purpose specified.
2. In a trimming machine, the combination of a bed-plate, an angular gauge
adjustably secured thereto, a lever actuated, reciprocating trimming knife,
supporting guide ways above and below said knife frame, an adjustable forward
edge plate secured to said gauge extending from said bed-plate to a point higher
than the knife-frame, and presenting an obstructed surface from top to bottom of
said gauge, substantially as and for the purpose specified.
3. In a trimming machine, the combination of a bed-plate having an arched slot
with a V-shaped cross section with its wider opening downward, a clamp having
two parts, one of which is adapted to fit in said V-shaped slot, and the other of
which is adapted to project upward through said slot and to fit into an arched
slot on the under side of the gauge; a wedge-shaped gauge and a binding bolt and
nut adapted to clamp the parts together, substantially as and for the purpose
described.
4. In a trimming machine, the combination of the bed, the gauge adapted to
move around the fixed centre, an adjustable forward edge to said gauge at the
centre, a holding clamp composed of the described segment of a double coned ring
adapted to fit in a slot having a cross section similar to that of the segment, a bolt
passing through said segment of ring and said gauge, and a nut adapted to hold
the parts together, substantially as and for the purpose described.
5. In a trimming machine, the combination of a knife frame, movable horizon-
tally, a gauge having a shearing edge thereon and actuating lever, and a rack and
pinion adapted to move said knife-frame, said rack being located below the
knives and closed in on its upper side, substantially as and for the purpose
specified.
6. In a trimming machine, the combination of the bed B, the covered rack J',
and way E; the said covered rack J' being adapted to move in close contact with
the forward vertical edge of the bed and to protect the way E from dirt and chips,
substantially as and for the purpose described.
Dated this 20th day of April 1893.
WM. P. THOMPSON & Co.,
Agents for the Applicant.