IMPROVEMENTS IN FEEDING MECHANISM FOR SAWING MACHINES."
Year: 1882

page_text: LETTERS PATENT to Robert Band Pope, of Dumbarton, in the County of
Dumbarton, North Britain, Engineer, for an Invention of "IMPROVEMENTS
IN FEEDING MECHANISM FOR SAWING MACHINES."
PROVISIONAL SPECIFICATION left by the said Robert Band Pope at the
Office of the Commissioners of Patents on the 15th February 1882.
ROBERT BAND POPE, of Dumbarton, in the County of Dumbarton, North
Britain, Engineer. " IMPROVEMENTS IN FEEDING MECHANISM FOR SAWING
MACHINES."
This Invention relates to the feeding mechanism of that class of sawing machines
in which the sawa or saw frames reciprocate vertically or in any other direction;
and its object is to provide a simple combination of parts which can be arranged
either for what may be termed double feeding to suit the saws when cutting in
both directions of their motion or for single feeding to suit the saws when cutting
in only one direction.
The improved mechanism is a modification of what is known as a form of "silent
feed" in which the feeding action for imparting progressive motion to the wood to
be sawn is primarily imparted to a feed wheel having a grooved periphery. An
eccentric curved wedge carried by a feed lever centered on the shaft of the feed
wheel engages with the grooved periphery when the feed lever is moved in the
feeding direction but becomes relieved when returning. The feed lever is worked
by a link from an intermediate lever made to vibrate by a rotating eccentric or
crank, the pin connecting the link to the intermediate lever being adjustable on the
lever by a screw by which the effective length of stroke can be varied. A second
link connects the feed lever to one arm of a small reversing lover centered on a
stationary fulcrum and the other arm of this reversing lever is connected by a link
to a second feed lever fitted also with an eccentric curved wedge to engage with
the grooved periphery of the feed wheel. With this arrangement each feed lever
moves in the direction for feeding whilst the other is returning and a feeding
impulse is given every time the intermediate lever moves in one direction, and also
every time it moves in the opposite direction. When single feeding is required the
link connected to the reversing lever is unfastened and then the second feed lever
with its eccentric curved wedge acts like a holding pawl to prevent the feed wheel
from moving in the wrong direction, and the other feed lever alone gives motion to
the wheel.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert Band Pope in the Great Seal Patent Office on the 12th
August 1882.
ROBERT BAND POPE, of Dumbarton, in the County of Dumbarton, North
Britain, Engineer.
"IMPROVEMENTS IN FEEDING MECHANISM FOR SAWING
MACHINES."
:
My said Invention relates to the feeding mechanism of that class of sawing
-machines in which the saws or saw frames reciprocate vertically or in any other
direction and its object is to provide a simple combination of parts which can be
"arranged either for what may be termed double feeding to suit the saws when
cutting in both directions of their. motion, or for single feeding to suit the saws
when cutting in only one direction.
My improved mechanism is a modification of what is known as a form of " silent
feed," in which the feeding action for imparting progressive motion to the wood to
be sawn is primarily imparted to a feed wheel having a grooved periphery. An 1
eccentric curved wedge carried by a feed lever centered on the shaft of the feed
'wheel'engages with the grooved periphery when the feed lever is moved in the
feeding direction, but becomes relieved when returning. The feed lever is worked
in the ordinary way; it is however connected by a link to a small reversing lever
which is connected to a second feed lever fitted also with an eccentric curved wedge
'to engage with the grooved periphery of the feed wheel. With this arrangement
each feed lever moves in the direction for feeding whilst the other is returning, and
'a feeding impulse is given every time the intermediate or reversing lever moves in
either direction.
4
And in order that my said Invention and the manner of performing the same
may be properly understood I hereunto append a Sheet of explanatory Drawings to
be hereinafter referred to, and showing the application of my improved mechanism
to a vertical sawing frame.
The Figure on the accompanying Sheet of Drawings is a side elevation showing
as much of a vertical sawing frame or machine as is considered necessary for
explaining my improvements. The feed wheel, 1, has formed in the same piece
with it or has otherwise fixed to it or turning with it a pinion gearing with spur-
wheels which are indicated by dotted circles, and which are fixed on the shafts or
journals, 2, of the feed rollers which carry the wood, 3, through the machine. The
'feed wheel, 1, is formed with a grooved periphery and when the parts are arranged
for single feeding, the feed motion is imparted intermittently to the wheel, by a
curved wedge, 4, shaped to engage with the grooves of the wheel, and jointed
eccentrically to a feed lever, 5, which is centered loosely on the shaft or stud
carrying the feed wheel, 1. The feed lever, 5, is worked by a link, 6 from an
intermediate lever, 7, made to vibrate by a rod, 8, from an eccentric or crank on
the main shaft which is not shown. The pin connecting the link, 6, to the
intermediate lever, 7, is adjustable on the latter by means of a screw and hand-
wheel, 9, by which the effective length of stroke can be varied. A second link, 10,
connects the feed lever, 5, to one arm, 11, of a small reversing lever, when the parts
are arranged for double feeding. This reversing lever is centered on a stationary
fulcrum, and, its other arm, 12, is connected by a link, 13, to a second feed lever, 14,
'fitted also with an eccentrically centered curved wedge, 15, to engage with the grooved
periphery of the feed wheel, 1. The second feed lever, 14, is also loosely centered on
the shaft or stud carrying the feed wheel, 1. With the arrangement shown in the
Figure the upward movement of the intermediate lever, 7, and link, 6, causes the

page_text: upper feed lever, 5, to move in the feeding direction, and the downward movement
of the same parts acting through the reversing lever, 11, 12, causes the lower feed
lever, 14, to move in the feeding direction.
When single feeding only is required the link, 10, connected to the reversing
lever, 11, 12, is unfastened and then the second feed lever, 14, with its eccentric
curved wedge, 15, acts like a holding pawl to prevent the feed wheel, 1, from
moving in the wrong direction, and then the other feed lover, 5, alone gives motion
to the feed wheel, 1, in the ordinary way.
Having thus particularly described my said Invention, and the manner of per-
forming the same I have to state that I do not restrict myself to the precise details
herein described or delineated but that what I believe to be novel and original and
claim as the Invention secured to me by and in terms of the hereinbefore in part
recited Letters Patent is :-
1. The arrangement of parts constituting the double feeding mechanism for
sawing machines, and in which there is combined with the ordinary "silent feed"
lever, a second feed lever operating in the same manner but alternately substantially
as herein before described.
2. The connecting of the ordinary "silent feed" lever to a reversing lever which
is connected to a second feed lever substantially as and for the purposes herein before
described.
In witness whereof, I, the said Robert Band Pope, have hereunto set my
hand and seal this Tenth day of August in the year of our Lord One
thousand eight hundred and eighty two
Witness
EDMUND HUNT
Patent Agent
Glasgow.
ROBERT B. POPE. (L.S.)