IMPROVEMENTS IN SAWING MACHINERY
Year: 1884

page_text: I SAMUEL SKINNER of No 1 New Place Old Town Eastbourne, in the County of
Sussex, Joiner, do hereby declare the nature of my invention for IMPROVEMENTS IN
SAWING MACHINERY to be as follows:-
--
To obtain a more perfect feed motion, and to a means of adjusting the saws to
the feed in a reciprocating saw frame, so that they may cut equally throughout the
stroke.
To obtain this I use a cam fixed on the crank shaft, which strikes against an
adjustable block connected with the ordinary silent clutch feed.
The cam and block are so adjusted that with a fast feed the Timber is fed
forward during the last two thirds of the up stroke, with a slow feed, the last
third, or less; the timber being brought close to the saws at the end of up stroke.
To enable the saws to be adjusted to the rate of feed, I make the crosshead at
top of saw frame, in two parts, the top part of which can be adjusted so as to make
the saws overhang according to the rate of feed, thus making each tooth cut its
fair share.
·lנ.1.ז
11
1

page_text: I SAMUEL SKINNER of No 1 New Place Old Town Eastbourne in the County of
Sussex Joiner do hereby declare the nature of my invention for "IMPROVEMENTS IN
SAWING MACHINERY" 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 obtain a more perfect feed motion than
heretofore in vertical reciprocating deal saw frames.
To obtain this result I use a cam which is keyed on the crank shaft and strikes
against an adjustable block connected with the ordinary silent clutch feed.
The cam and block are so adjusted that with a fast feed the timber is fed forward
during the last two thirds of the upstroke and with a slow feed the last third or
less, the timber being brought close to the saws at the end of up stroke.
In the accompanying drawings I have shown at Figures 1 and 2 in side elevation
and front view my improvements as applied to an ordinary vertical reciprocating
deal saw frame and at Figures 3 and 4 a side and end elevation of the tenoning
machine for which I obtained Letters Patent dated the 1st January 1880 N° 11
with the new feed motion adapted thereto.
Referring now to Figures 1 and 2 A is the frame of the machine and B the feed
rollers on which the wood rests.-These rollers are driven by gear wheels actuated
by a silent clutch arrangement in the usual manner.
C is the main driving shaft of the machine to which motion is communicated in
any convenient manner from the prime mover Upon the shaft C is mounted a
cam D against which bears the foot of a rod E This rod is supported in guides or
brackets a secured to the frame A and carries near its upper end a tappet or
finger b which as the rod E is raised by the rotation of the cam strikes against the
arm c of the silent clutch arrangement and raises it thereby rotating the wheel d
the required distance to give the desired amount of feed to the rollers B.
The tappet slides on the rod E the end of which is bent over at 6 and carries
an adjusting screw f which works in the tappet.
By this means the tappet is raised or lowered as desired to regulate the feed as
will be presently explained.
The arm c when in its normal position rests on a fixed stop g and it always
regains this position by its own weight as the tappet retreats.
When it is desired to obtain a quick feed the tappet 6 is raised by turning the
screw until the tappet touches the arm c.-As soon as the rod E commences to
rise under the influence of the cam D motion is immediately communicated through
the silent clutch arrangement to the feed rollers B and this movement continues
during the whole time the rod E is rising As the rod E descends with the tappet,
by its own weight or under the influence of a spring, the arm c follows until it
comes in contact with the fixed stop g.
When a slow feed is desired the tappet is lowered by means of the screw f say
into the position shown in the drawing.
The distance between the underside of the arm c and the face of the tappet b
will have to be covered before any motion will be communicated to the clutch
arrangement and the amount of motion given will be correspondingly less.
Referring now to Figures 3 and 4 I will mention only such parts of the tenoning
machine as are necessary for present purposes the remaining parts being fully
described in the Specification of my Patent before referred to.
The cam D is mounted on one end of the crank shaft and resting against the cam
is a rod E. This rod is supported, at one end by a pin or stud h which projects

page_text: through an inclined slot h¹ made in the foot of the rod E, and at the other end by
the arm c of the silent clutch arrangement.-The weight of the foot in combination
with the inclined slot h¹ will ensure the foot always regaining its normal position.
The rod E is made in any suitable manner to permit of its length being increased
or diminished according to the speed of feed it is required to give.-g is a fixed
stop against which the arm of the clutch arrangement always rests so that
on shortening the rod E the foot will be drawn away from the cam surface thereby
providing for a slow feed as before described.
Upon the axle of the silent clutch arrangement is mounted a pinion c³ (see
detailed views Figures 5) which gears with a rack i formed on the under side of
the saddle E' and by which means the slide or table carrying the wood to be cut is
propelled forward.
The means for giving the return motion to the slide are the same as those
described in the Specification of the Patent before referred to, that is to say, a train
of gear wheels acting on a pinion of suitably mounted and gearing with the rack i
as indicated in Figs 5.
As however one of the pinions or c must be thrown out of gear while the
other is in gear I provide a simple clutch arrangement which is clearly indicated in
Figs 5 such clutch arrangement being operated by the handle I or in any other
convenient manner.
To enable the saws to be adjusted to the rate of feed I make the cross head at
the top of the saw frame in two parts the top part of which can be adjusted so as
to make the saws overhang according to the rate of feed thus making each tooth
cut its fair share This mode of adjustment is clearly described and shown in the
Specification and drawings of my Patent before referred to.
It will be evident that a pawl and ratchet or any other suitable motion may be
substituted for the silent clutch arrangement.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
1. The improved feed motion for vertical reciprocating saw machines or frames
substantially as herein shown and described.
2. In a feed motion for vertical reciprocating saw machines or frames the
combination of a cam as D, rod as E, provided with an adjustable tappet as b or
equivalent contrivance for lengthening or shortening the rod and a stop g with a
silent clutch arrangement or other suitable means for communicating a forward
motion to the material to be cut as set forth.
Dated this 15th day of December 1884.