AN IMPROVED AUTOMATIC FEEDING MOTION FOR WOOD TENONING MACHINES
Year: 1886

page_text: Machines.
"
I NOEL NEWALL HAIGH of Globe Iron Works Oldham in the County of
Lancaster Machinist, do hereby declare the nature of my invention for "AN
IMPROVED AUTOMATIC FEEDING MOTION FOR WOOD TENONING MACHINES and in
what manner the saine is to be performed, to be particularly described and
ascertained in and by the following statement:-
The object of this invention is to construct an automatic feeding motion for the
carriage of wood tenoning machines which shall present the work to the cutting
tool and force it forward the required distance and then throw the driving motion
out of gear.
The precise nature of my invention and the manner of carrying the same into
practical effect will be readily understood on reference to the annexed sheet of
drawings and the following explanation thereof.
Fig. 1. on the drawings is an elevation and Fig. 2. a plan view of so much of a
wod tenoning machine as is necessary to illustrate the application of my invention
thereto.
Fig. 3 is a plan view of the improved apparatus (detached) drawn to a larger
scale and Figs. 4 and 5. are a plan view and elevation of a modification of the
same.
a, a is the framing of the tenoning machine. b,b the work carriage moving on
slides c, c, d, d is the main driving shaft. Round this shaft passes an endless
strap e, e passing also round a pulley f; f keyed at one end of a shaft g, g.
At the other end of this shaft is keyed a spur pinion h, h driving a similar
wheel, which runs loose upon a stud. On the same stud and close to the
wheel i, i is a smaller pinion k, k (also loose on the stud) in gear with a long
toothed rack, attached to the underside of the carriage b, b. The wheel i, i and
pinion k, k are furnished the one with an internal cone and the other with an
external cone as shown by dotted lines on Figs. 3 and 4. so that when the two are
pressed together the wheel i, i (which is always in motion) will drive the pinion k, k
and cause the rack. 7, to move the carriage forward, but as soon as the wheel i, i
is withdrawn from the pinion k, k the latter is no longer driven but becomes loose.
and the carriage with the work can then be drawn back.
The automatic working of this feed motion is effected as follows.
Upon a convenient part of the frame is mounted a lever m, m (see detached
view Fig. 3.) and to the carriage b, b is attached a slotted bar n, n in which are

page_text: adjustable two studs o, o¹. Attached also to the frame is a spring p, p provided
with a stud 9, 9 pressing against the boss of the wheel i, i so as to press it against
the pinion k, k. The end of this spring p, p is bent and passes round a pin m²
fixed in the lever mm, and the spring keeps the wheel i, i and pinion le, k in gear
until the carriage has reached the end of its traverse, when the stud o comes
in contact with the lever m, m causing the pin m² to be forced against the curved
part ** of the spring p, p so as to take the pressure off the wheel i, i, and thus
stop the forward motion of the carriage.
The latter is now free to be drawn back and when the work is re-adjusted,
a slight movement of the carriage will cause the stud o¹ to move the lever back
so as to release the spring and allow the wheel i, i to drive the pinion k k.
The studs o, and o' are adjustable in the slotted rail or bar nn to suit the
dimensions of the tenon to be cut or formed.
In the modification shown at Figs. 4 and 5 the slotted rail or bar n, n is provided
with two inclines o, and o¹ (instead of pins). The lever m, m is a spring lever and
has a tendency to leave the wheel i, i free of the pinion k, le so that the one cone
will not drive the other excepting when the lever m, m is forced inwards by the
incline o¹ working against the projection m², m¹ in which position it is held by the
spring catch p, p until the incline o comes into contact with the projection, or
the handle at ** so as to force back the spring catch p, p, releasing the spring
lever m, m and allowing it to withdraw the pressure from the boss of the wheel i, i
when the friction cones will cease to drive and the carriage will be released.
Having now particularly described and ascertained the nature of iny said
Invention and in what manner the same is to be performed I declare that what
I claim is :-
. First. The improved construction of automatic feeding motion for wood tenoning
machines substantially as hereinbefore described and illustrated by the drawings
annexed, and
Secondly. I claim the use of friction gear for such purpose, the said gear being
thrown into and out of action automatically by the movement of the work
carriage.