Improvements relating to the Feed Motion of Log and Deal Sawing Frames whereby the Feed is made Positive and much Simpler.
Year: 1892

page_text: Date of Application, 16th Mar., 1892
Complete Specification Left, 16th Dec., 1892-Accepted, 4th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements relating to the Feed Motion of Log and Deal Sawing
Frames whereby the Feed is made Positive and much Simpler.
ROBERT HEWITSON Albert Works Boundary Lane Walworth in the County of
Surrey Engineer do hereby declare the nature of this invention to be as follows:-
In carrying out my invention in lieu of the ordinary eccentric feed motion usually
employed I use a round or flat band driving from the crank shaft of the machine,
and operating a vibrating pendulum, at the foot of the pendulum is a small grooved
friction wheel running on a spindle. This gears into a larger grooved wheel
mounted on a spindle running across the front of the frame of the machine these
two friction wheels are brought into gear or contact by means of a lever and
suitable weight.
On this second spindle is mounted a worm, this in its turn gears into a suitable
worm wheel which operates on either vertical or horizontal feed rollers as may be
required.
"
1
1000
ROBERT HEWITSON.
COMPLETE SPECIFICATION.
Improvements relating to the Feed Motion of Log and Deal Sawing
Frames whereby the Feed is made Positive and much Simpler.
I ROBERT HEWITSON of Albert Works, Boundary Lane, Walworth, in the
County of Surrey Engineer 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 :-
This invention will be best understood by describing the same with aid of the
accompanying drawings.
Figure 1. front elevation of a sawing machine embodying this invention.
Figure 2. side view.
Figure 3. sectional plan shewing feed gear.
Figure 4. detached portion of sectional front elevation shewing part of feed gear.
The two main driving shafts A and B carry crank discs C and D, operating by
connecting rods E and F, saw frames G and H, feed rollers J and K, and J' and K¹,
which are revolved for the feed purpose by the following arrrangement. The central
rollers K and K', are mounted upon vertical short shafts K³, held in suitable
bearings K, arranged to be laterally adjusted as required by any known means.
The tops of these shafts K2, have keyed on to them worm wheels K. The
rollers J and J, are also carried by short shafts K, also having top end keyed to
a worm wheel K. The bearing or carrier which supports these shafts K, is
arranged to have an adjustable lateral movement towards the rollers K and K',
to enable the timber passing between to be gripped for the feed with compensating
means for varying thicknesses of the wood. The lateral movement and continuous
grip is given by the weight L, attached by chain L', to lever L³, keyed on to
vertical spindle M held so as to partially turn by movement of the lever. The top
of this spindle has a keyed on arm M¹ with slot M². Projecting from the shafts K
are rod arms N and N passing through suitable guide in side of main frame; on
the underside of which is a slot through which projects a pin M³ connected to the
underside of rod N and engaging the slot in arms M'. The arms N' similarly
project through side of frame and have a projecting pin M on underside against

page_text: which the lever rod L' bears, by the above described arrangement the rollers J
and J have a continuous and adjustable lateral pressure towards the rollers K
and K¹ by the action of the weight L. The shafts K' and K', which carry the feed
rollers are revolved to give the feed by the worms O, gearing into the worm wheels K⭑.
This allows lateral movement by variations in thickness of wood passing through
without interfering with the feed. These worms O, are keyed on to short
shafts P and P', revolved by friction gearing Q and Q', driven as follows-Pivotted
to the upper part of the main frame is a pendulum R, carrying at bottom a cross
shaft R', upon which is keyed a pulley wheel R³, and a friction pinion Q¹. The
pulley R is connected by strap to a small pulley R³ on main driving shaft.
The tension of the strap causes the pendulum to be drawn towards the vertical
which brings the friction pinion Q' into bearing with the larger friction wheel Q,
the bite of the pinion with the latter wheel is assisted by the arm S, bearing
against the outside of bottom of pendulum by aid of the weighted lever S¹; raising
the lever S', the slightest degree frees pinion Q', from wheel Q: T, T, are
depending arms fitted with stops R, to prevent wood rising while being sawn.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what 'I
claim is---
In wood sawing frame machines:
1-For the driving of feed rollers, the combined use of worm and friction gearing
arranged substantially as described and illustrated by the accompanying drawings.
2-A. pivotted movable pendulum carrying a cross shaft at bottom arranged to
revolve on which is keyed a pulley wheel to be turned by strap and a friction
pinion arranged to be pressed by the vibration or movement of the pendulum
towards the vertical against a friction wheel to engage same, the bite of the pinion
being assisted by any known means such as a weighted lever, all substantially; as
described and illustrated by the accompanying drawings.
Dated this 16th day of December 1892.
FREDERIC PRINCE,
1, Quality Court, Chancery Lane, London, W.C., Agent for Applicant.