Improvements in Machines for Cutting Metal.
Year: 1899

page_text: Date of Application, 15th Aug,, 1899-Accepted, 21st Apr., 1900
COMPLETE SPECIFICATION.
Improvements in Machines for Cutting Metal.
We, JOHN PETER MATHIEU, of 1605, Allegheny Avenue, in the City of Phila-
delphia, State of Pennsylvania, United States of America, Leather Manufacturer,
and WILLIAM HENRY LUCAS and FREDERICK HENESS GLIEM, both of 1307, Ridge
Avenue, also in said City of Philadelphia, Machine Builders, 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 increase the field of work of a metal cutting
or sawing machine.
We will describe our invention with reference to the accompanying draw-
ings of which Fig. 1, is a front view of a machine of the class known as a
cold saw cutting-off machine," showing the application of the invention thereto;
Fig. 2, is a plan or top view of the same;
Fig. 3, is a front view of part of the work carrying portion of the machine; and
Fig. 4, is a sectional view on an enlarged scale of part of the driving mechanism.
1 represents the fixed bed of the machine which constitutes a guide for the
saw carriage 2, the saw 3 (which may be either toothed or plain) being mounted
upon a spindle 4, which is driven by means of spur gears 5 and 6 from a
parallel spindle 7, the latter having a worm wheel S which gears with a worm 9
on the driving shaft 10 at the front of the machine, this worm gear being
enclosed in a box on the carriage 2 and being free to travel along the driving
shaft as the said carriage is reciprocated.
The feed screw 11 of the carriage 2 is operated by a clutch 12 which is under
control of a lever 13 having a rod 14 projecting alongside of the bed 1 and
adapted to be struck by a projection on the carriage 2 so as to throw the clutch
out of operation when the carriage reaches the limit of its movement in either
direction, the clutch being driven at slow speed during the forward or cutting
movement of the carriage, and at higher speed during the return movement.
The slow speed movement is derived from a worm wheel 15 which gears with a
worm on a transverse shaft 16 driven from the shaft 10 by means of friction
discs 17 and 18, the quick or return movement being imparted to the clutch 12
by means of spur wheels 19, 20 and 21, the wheel 19 being secured to the
shaft 10 and the wheel 21 having a hub adapted to engage with a friction cup
which forms part of the clutch.
All of these parts are substantially similar to those used in cold saw cutting-off
machines of ordinary construction, the novel features of this invention com-
prising the special construction and arrangement in respect to the saw, of the
parts of the work-supporting table or bed.
The latter comprises three parts, namely, the flat bed 22 for receiving sheets
or plates, the V-shaped groove or recess 23 for receiving shafts or circular rods
and the depressed table or shelf 24 for receiving girders beams or the like, the
said table or shelf 24 being situated on the near side of the flat bed 22, that
is to say, the side which the saw first approaches in its forward cutting-movement,
☑
"

page_text: The flat table or bed 22 is provided with a clamping yoke 25, the grooved work
holder 23 with a clamping yoke 26, and the table or shelf 24 with a clamping
yoke 27, these yokes being under control of nuts 28 and 29 on screws 30, 31, 32
and 33 projecting upwardly from the fixed structure of the machine, and, in
order that either clamping yoke may be operated independently of the others the
yoke 27 is hung to the screw 30 and has an open jaw 34 for embracing the
screw 31, the yoke 26 is hung to the serew 33 and has an open jaw 35 for
embracing the screw 32, and the yoke 25 has at one end an open jaw 36 embracing
the screw 31, and at the other end a similar, but oppositely facing, open jaw 37
embracing the screw 32.
By means of this construction, therefore, the yokes 26 and 27 can be thrown
out of engagement with the screws 31 and 32 when it is desired to operate the
yoke 25, and the latter can be thrown out of engagement with the screw 31 when
it is desired to operate the yoke 27, or out of engagement with the screw 32 when
it is desired to operate the yoke 26.
The yokes are also provided, by preference, with adjustable clamp screws 38
as shown.
By arranging the table or shelf 24 on the near side of the table or bed 22 as
described, a beam can be placed on the said table or shelf 24 at any desired angle,
as shown for instance by dotted lines in Fig. 2, and can therefore he cut off
at any desired angle in respect to the longitudinal line of the beam, and at any
desired point in its length, and in this respect this invention is an improvement
upon that class of machines in which the beam supporting table or shelf is arranged
at the far side of the fiat bed 22, for in the latter case, the beam must be placed
at an angle the reverse of that shown in Fig. 2, and hence could not be cut at
an angle at a point remote from either end as the projecting portion of the
beam in such case would come in contact with the saw carriage before the com-
pletion of the cut, therefore, in operating this class of machines it became neces-
sary to make two cuts, first directly across the beam so as to reduce the length
of the same to the desired extent and then angularly on the slightly projecting
end of the beam, thus involving not only waste of time but loss of material.
The periphery of the friction disc 18 bears against the flat face of the friction
dise 17 on the driving shaft 10, hence by moving the said friction disc 18 to
and fro across the face of the disc 17 the speed of the worm shaft 16 may be
increased or diminished or the said shaft may be stopped altogether by adjusting
the disc 18 so that it coincides with the axis of the disc 17.
The movement of the disc 18 and shaft 16 is effected by means of a lever 40
hung to a suitable stud on the fixed frame of the machine and slotted for engage-
ment with a pin 41 on a rod 42 which is guided in suitable fixed bearings and
has a fork 43 engaging with the grooved hub of the disc 18 as shown in Fig. 2.
The disc 17 is splined or otherwise suitably mounted on the end of the
shaft 10, so that it can slide longitudinally thereon, but is compelled to turn
therewith, and the said disc is pressed outwardly on the shaft 10 into contact
with the periphery of the disc 18 by the action of a spring 45 (see Fig. 4) con-
tained in a recess in the end of the shaft 10, the said spring acting on a block 46
upon which bears a set screw 47 screwing in a central threaded opening in
the disc 17, hence by manipulating the said set screw 47 the spring 45 can be
compressed to a greater or less extent and the consequent pressure of the disc 17
against the disc 18 can be regulated to accord with the amount of power which
it is desired to transmit, as well as to compensate for the effects of wear.
As both ends of the spring bear against correspondingly rotating parts there
is no friction upon or wear of the spring, as there would be if one of the bearings
of the spring was fixed and the other rotated.
By moving the driven friction dise across the face of the driving friction dise
the speed is reduced and the power increased, as the driven disc approaches the
centre of the driving disc, hence much slower speeds are permissible than when
the reverse construction is adopted,

page_text: Having now particularly described and ascertained the nature of our invention,
and in what manner the same is to be performed, we declare that what we
claim is:-
The combination of the travelling saw carriage with the work table having a
flat bed and a beam supporting table or shelf on the near side of the said table
or bed and below the same substantially as herein before described.
Dated this 15th day of August 1899.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.