A Machine for Planing or Stripping the Mitres of Picture Frames and the like.
Year: 1898

page_text: Date of Application, 13th Apr., 1898
Complete Specification Left, 13th Jan., 1899-Accepted, 18th Feb., 1899
PROVISIONAL SPECIFICATION.
A Machine for Planing or Stripping the Mitres of Picture Frames and
the like.
We, PAUL CAMPBELL & SONS LTD., Picture Frame Makers, and ROBERT WIL-
KINSON, both of Silvergrove Works, Silvergrove Street, Glasgow, North Britain,
do hereby declare the nature of this invention to be as follows:-
This invention relates to a machine for planing or stripping the mitres of
picture frames and the like.
In the carrying out of our invention, we employ a table having guides thereon.
against which the wood of the picture frame moulding is held; the ends of the
moulding having previously been cut roughly to the approximate angle by, a.
circular saw; the angle at which the guide is set determining the angle or bevel
which is to be cut upon the end of the moulding. The plane instead of being
operated by hand as hitherto is operated mechanically by power through the
intervention of a crank and connecting rod, the arrangement being such that
the plane is reciprocated backwards and forwards whilst the iron or cutter of the
blade, mitres or planes the end of the wood of the moulding to the required angle.
We prefer to employ two guides so that two mouldings can be mitred at once.
In this case a double plane is employed that is to say a plane having two cutters
set at opposite angles; the guides for the mouldings being, similarly, set at oppo-
site angles to each other that is to say the two guides meet at a common centre
or apex.
The double plane is so set that as the plane reciprocates, each iron
reaches no further than the centre of the apex of the moulding's guide so that
each guide mitres the wood of the one moulding only so that the mitreing of each
moulding is in the one direction, only.
We prefer to employ a plane with a deep cutter, the arrangement being such
that when the plane commences its work, only a portion of the depth of blade is
brought into cutting operation. When a certain number of mouldings have been
mitred, a fresh portion of cutting edge is brought into operation by bringing the
mouldings to a higher level by means of blocks of wood or other means, the
mouldings being raised for a third time or further still accordingly to the depth
of the cutting edge of the plane. The plane may be set within a dovetailed groove
and reciprocated by connecting it with the end of an arm which is rocked by
means of a crank driven from a shaft by belt and pulley.
In order to ensure the mouldings being mitred to the required length, we
employ two guides having gauges secured thereto within which guides the mould-
ings may be held by hand; the travel of the said guides being regulated by a
screw as desired.
1000

page_text: A Machine for Planing or Stripping the Mitres of Picture Frames and
the like.
We, PAUL CAMPBELL & SONS LTD., Picture Frame Makers, and ROBERT WIL-
KINSON, both of Silvergrove Works, Silvergrove Street, Glasgow, North Britain,
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 fol-
lowing statement: —
This invention relates to a machine for planing or stripping the mitres of
picture frames and the like.
In accordance with our invention we employ a table having guides thereon
against which the wood of the picture frame moulding is held, the ends of the
moulding having previously been cut roughly to the approximate angle by a
circular saw. The plane instead of being operated by hand as hitherto is operated
mechanically by power through the intervention of a crank and connecting rod,
the arrangement being such that the plane is reciprocated backwards and forwards
whilst the iron or cutter of the blade, mitres or planes the end of the wood of
the moulding to the required angle.
We prefer to employ two guides so that two mouldings can be mitred at once.
In this case a double plane is employed, that is to say a plane having two cutters
set at opposite angles; the guides for the mouldings being, similarly set at oppo-
site angles to each other so that they meet at a common centre or apex. The
double plane is so set that as the plane reciprocates, each iron reaches no further
than the centre of the apex of the mouldings' guides, so that each iron mitres
the wood of the one moulding only whereby the mitreing of each moulding is
performed in one direction only.
The plane is preferably formed with a deep cutter, so that when the plane com-
mences its work, only a portion of the depth of the blade is brought into cutting
operation. When a certain number of mouldings have been mitred, a fresh por-
tion of cutting edge is brought into operation, this being effected by lowering the
table carrying the guides.
But in order that our said invention may be more readily understood and easily
carried into effect we will proceed to describe the same with reference to the
accompanying drawings in which
Fig. 1 is an elevation
Fig. 2 a plan and
Fig. 3 an end view of the machine as constructed in accordance with our
invention.
Referring to the said drawings we employ a table A which is formed with two
channels or beds constructed to receive the guides B, which guides are arranged at
the angle to which the mouldings are to be mitred. The plane C for performing
this mitreing is provided with two cutters, e arranged at opposite angles to each
other in such a manner that one cutter is in action during the forward and the
other during the backward stroke, both mouldings being mitred in the same
direction. The plane C is mounted upon the slide D, shewn more particularly in
Fig. 3, and reciprocated by the connecting rod E through the intervention of
the disc e, or crank, operated by any ordinary shaft, belt and pulley arrangement.
The guides B may be advanced to feed the moulding to the plane irons, by
means of the levers F pivoted at f and having their ends connected respectively
to the guides and to cords G. The said cords pass over guide pulleys and are
. connected to a foot treadle H which when pressed down thus communicates its

page_text: motion to the levers and moves the guides forward. The travel of the said guides
is limited by the stops J which are secured to the table work in the slots j of
the guides and in order that the guides may be returned to their normal position,
in which position the parts are illustrated in the various figures, springs K are
attached to the ends of the levers F as shewn.
In order to ensure the mouldings being mitred to the required length, we
employ two gauges L working in the slots of the guides and arranged to be
bound by a butterfly or other nut at the required position, the one mitred end of
each of the mouldings fitting into a recess formed in the said gauge for its
reception.
To enable the mouldings to be held at different levels relatively with the plane
so that upon one portion of the plane iron becoming blunted, by the composition
of the moulding or through other causes, the moulding can be lowered to be
acted upon by a fresh portion of the iron, we mount the table so that it is free
to advance up or down upon the slide M, the said movement being controlled by
the screw m working through a nut secured to the framing of the machine and
operated by a hand wheel m¹ and bevel cogs N.
The foregoing serves as an example of how our invention may be carried into
effect but we desire it to be understood that we do not limit ourselves to the
precise details herein before described as it is obvious that they may be varied
without departing from the scope of our invention.
Having now particularly described and ascertained the nature of our said-
invention and in what manner the same is to be performed we declare that what
we claim is;-
1. The general arrangement, construction and combination of parts constituting
the machine for planing or stripping the mitres of picture frame mouldings and
the like, substantially as herein before described and shewn in the accompanying
drawings.
1
2. In a machine for planing or stripping the mitres of picture frame mouldings
and the like, the double plane C constructed, arranged and operated mechanically
by power, substantially in the manner as and for the purpose hereinbefore
described and shewn in the accompanying drawings.
3. In a machine for planing or stripping the mitres of picture frame mouldings
and the like, the combination of the table A, and the means for raising and
lowering same, with the two guides B, having gauges L, and the means for
advancing the guides towards the plane all constructed, arranged and operating
substantially in the manner as hereinbefore described and shewn in the accom-
panying drawings.
JOHNSONS,
Applicants' Agents, 115, St. Vincent Street, Glasgow.