MITREING PRINTERS BRASS RULES
Year: 1885

page_text: We JAMES DANIEL Cook and ALFRED LIVINGSTONE COOK of 8 Milton Street,
Cripplegate, London, manufacturers of printing materials do hereby declare the
nature of our invention for MITREING PRINTERS BRASS RULES to be as follows:-
The Machine consists of two main portions, viz: (1) the Back or Standard and
(2) the Table. The Back stands upon a Foot-plate, and is divided in the upper
part, and being there grooved on its inner edges, forms a pair of guides for the
knife carrier which is tongued on the outer edges, so as to slide up and down within
the guides, the front side of guides and carrier being level to each other.
The knife is fixed nearly horizontally in a wide slot in the carrier, but slightly
inclined downwards in front so that it meets the end of the Brass Rule to be cut
at an angle of about 105° and is held securely by means of a screw passing through
a slot in an ear projecting from the back of the carrier.
The slot allows the screw and the cutter in holds to be propelled forward to any
required extent beyond the level face of the carrier, thus producing the required
fineness or coarseness of the cut, which is accomplished by another screw working
horizontally, the point of which acts upon the stem of the binding screw, and is
bushed with a piece of iron to protect the stem of the one from the point of the
other. The return motion is produced by a spring attached to the top of the
carrier, which acts on the cutter in the contrary direction when the regulating
screw is slackened and its pressure removed. The knife carrier is raised and
lowered by a lever having its fulcrum at a boss at the back of the machine at the
side farthest from the handle; a pin in the back of the carrier works in a hole in
the lever, which is slotted to allow the play required by the motion of the lever in
rising and falling.
The table upon which the rule is placed to be mitred is semicircular in form, and
is screwed on its flat or diameter edge to the back or standard so that the knife
carrier comes close to this edge. The table is further supported by a pillar or leg
near its circumference, which is screwed to it above and to the foot-plate below.
The angle to which the rule is to be cut or mitred is regulated by an octant resting
on the table, and revolving on a pin at their common centre, close to the knife
carrier. It can be adjusted to any angle, and fixed by a bolt passing through a
hole in the octant, and through a slot running round near the edge of the table,
with a flynut underneath. The table is indexed to show the angles to which the

page_text: rule is to be cut, one radius of the octant being brought close to the indexed
figures, and the rule being held upright against it; the lever is then raised, and the
rule advanced to the face of the carrier; the lever being then lowered, a shaving is
taken off by the knife from the end of the rule, which will be coarse or fine
according to the set of the cutter.
The improvements for which we claim the protection of Letters Patent are-
First. The regulating screw and spring, these being a very simple and effective
contrivance not hitherto shown in any Mitreing Machine.
Secondly. The Pillar or Leg, which supports the table and greatly strengthens
both it and the back, and secures them against strain or breakage.

page_text: Figure 3 19 a back view of the upper part of the knife-carrier showing our
improved means for adjusting the knife or cutter.
Figure 4 is a vertical section of the same on the line of Figure 3.
Like letters indicate like parts in all the figures.
The machine consists of a base-plate a from which rises a vertical standard or
back-plate b. To the front of the standard b and at right angles thereto is secured
a semi-circular table or platform o upon which the "rule" is placed to be mitred.
The said table or platform may be screwed or otherwise attached, by its straight or
diameter edge, to the standard b, and it is further supported by a pillar or leg d
screwed into the underside of the said table and into the base-plate a. A guide o
revolves on the table c upon a pin or pivot e² projecting from the bottom of the
said guide into the table or platform c, the said pin or pivot being the centre of the
circle of which the guide e describes an arc as it revolves on the table c. The sides e¹
of the said guide are at such an angle that when one side is at right angles to the
edge of the knife or cutter the other side of the said guide is at an angle of 45° to
the said knife or cutter. On the upper surface of the table c is an index by which
the guide e can be set to any desired angle and thus the angle of the mitre to be
cut is regulated. A bolt e³ passes through the guide e and through a concentric
slot o¹ in the table c and a fly-nut e' screws upon the end of the bolt e³ below the
table. By means of this bolt and nut the guide e can be clamped in any desired
position.
In the standard b is formed a central vertical slot f extending from the top of the
said standard to near the base-plate a. The sides of the said slot are grooved and
thus the standard forms a pair of guides for the knife-carrier g. The knife-carrier g
is formed with tongues g¹ on its edges, the said tongues fitting into the grooves in
the slot so as to permit of the free reciprocating movement of the knife-carrier g
within the said grooves and slot. The face of the knife-carrier 9 is nearly flush
with the face of the standard b as shown in Figure 2.
The knife or cutter h, which resembles a plane-iron, is fitted in a slot i in the
knife-carrier g with its cutting edge downward and projecting more or less beyond.

page_text: the face of the knife-carrier g. The said slot extends horizontally across the knife-
carrier g but inclines slightly from back to front of the said knife-carrier, so that
the knife when inserted in the said slot inclines slightly upwards towards the back
and meets the end of the "rule" to be cut at about an angle of 100° to 105° as
shown in Figure 4. On the back of the knife-carrier g immediately above the
slot is formed an ear or projection j. A vertical slot at right angles to the face
of the knife-carrier g is formed in the top of the said knife-carrier and in the ear j,
the said slot opening into the slot in which the knife or cutter is inserted.
A clamping screw k passes through the slot ¹ into the knife or cutter h as shown
in Figure 4 by means of which screw the knife can be secured in any desired
position.
When
The adjusting screw 7 works horizontally through the end of the ear j and acts
upon the stem of the screw k. A gun-metal or other bushing is inserted between
the point of the screw Z and the screw k, to prevent the wearing of the latter screw
by the point of the former. A detachable top g³ is secured to the knife-carrier g
by screws g. The back of the said top g³ is recessed as shown at 95 Figures 3
and 4 and in the said recess is secured one end of a vertical flat spring m.
the top g³ is secured in position the free end of the spring m is in the slot j¹ and
sets against the clamping screw k keeping the said screw, the bushing ; and the
regulating screw. in contact with each other when the clamping screw is released.
The knife or cutter h is adjusted to give the required fineness or coarseness of cut
by loosening the clamping screw ke sufficiently to allow it to move in the slot j
and turning the adjusting screw l. By turning in the screw the screw k is forced
along the slot j' and 'the knife is propelled forward to any required extent.
slackening the screw the reverse movement is effected and the knife or cutter
repelled by the action of the spring m. When the knife has been adjusted as
desired it is again clamped in position by the clamping screw. k.
On
Any other suitable spring. may be employed in place of the spring m. for giving
the return movement of the knife or cutter.
The knife-carrier g is. raised or lowered by a lever. n having its fulcrum at a
boss o at the back of the standard b. A pin p at the back of the knife-carrier g
works in a slot n¹ in the lever so that by the operation of the said lever a recipro-
cating movement can be imparted to the knife-carrier g.
"
The knife or cutter having been set to give the desired cut and the guide e set
to give the desired angle to the mitre the "rule" is held upright against the side
of the said guide, the lever n is raised and the "rule" advanced to the face of the
knife-carrier.g. The lever n being then depressed a coarse or fine shaving is taken
off by the knife or cutter / from the end of the "rule" according to the set of the
knife or cutter.
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
In a printer's mitreing machine, the means for adjusting the position of the knife
or cutter; consisting of the adjusting screw Zin combination with the spring m or
its equivalent, arranged and operating substantially as herein set forth.
1000