Improvements in the Feed Mechanism of Machines for Cutting Metals.
Year: 1892

page_text: Date of Application, 25th Nov., 1892
Complete Specification Left, 18th May, 1893-Accepted, 1st July, 1893
PROVISIONAL SPECIFICATION.
Improvements in the Feed Mechanism of Machines for Cutting
Metals.
JOHN FREDERICK ROBINSON Atlas Works, Springburn Glasgow, Engineer,
GEORGE OLDFIELD, Atlas Works, Springburn Glasgow, Engineer do hereby
declare the nature of this invention to be as follows
This invention consists of, First:-A grooved cam of helical form, capable of
revolving on its axis, but prevented from moving longitudinally by suitable guides.
Second: A pin (or pins) attached to a slide, which is capable of being moved
longitudinally, that is, in a direction parallel with the axis of the cam, referred to
above, the said pin (or pins) fitting the groove of the cam.
The action is as follows:-When the slide is moved longitudinally, the pin
(or pins) press against the sides of the groove in the cam, as against an inclined
plane, & cause the cam to revolve, either through a complete circle, or more or less
as may be required. The movement of the slide which actuates the cam, can be
varied, & is effected by moving tappets on the machine.
The cam is connected to the feed screws, by a ratchet wheel, & other suitable
gear.
The feed is put on, at one end of the stroke of the machine, & the ratchet pawl
is moved backwards at the opposite end, but the ratchet wheel may make a com-
plete revolution if required.
'Our invention being substantially as described above, on Sheets 1 & 2.
ค
1
AT
1000
JOHN FREDERICK ROBINSON.
GEORGE OLDFIELD.
COMPLETE SPECIFICATION.
Improvements in the Feed Mechanism of Machines for Cutting
Metals.
JOHN FREDERICK ROBINSON, Atlas Works, Springburn Glasgow, Engineer,
GEORGE OLDFIELD Atlas Works Springburn, Glasgow, 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 consists of First: A grooved cam of helical form, capable of
revolving on its axis, but prevented from moving longitudinally, by suitable guides.
Second: A pin (or pins) attached to a slide, which is capable of being moved
longitudinally, that is, in a direction parallel with the axis of the cam referred to
above, the said pin (or pins) fitting the groove of the cam.
The action is as follows:-When the slide is moved longitudinally, the pin
(or pins) press against the sides of the groove in the cam, as against an inclined
plane, and cause the cam to revolve, either through a complete circle, or more or
less, as may be required. The movement of the slide which actuates the cam, can
be varied, & is effected by moving tappets on the machine.
The cam is connected to the feed screws, by a ratchet wheel, and other suitable
gear.
The feed is put on, at one end of the stroke of the machine, and the ratchet

page_text: pawl is moved backwards at the opposite end, but the ratchet wheel may make a
complete revolution if required.
Our invention is illustrated upon two sheets of drawings, marked 1 and 2.
accompanying this Specification.
Sheet 1. shows the general arrangement of our improved feed mechanism,
applied to an ordinary planing machine.
66
Fig. 1. is an "end elevation," Fig. 2. is a "side elevation," Fig. 3. is a
'plan," and Fig. 4. is a "plan" of the grooved cam C, of helical form, as referred
to in our Specification.
'
The groove of the cam C, has a straight portion C¹, of a suitable length, to
allow for the variable over-run of the table, when reversing takes place.
In the arrangement, as shown upon Sheet 1, the point of the pin B works in the
helical groove in C. B, can be adjusted in a slot in E, but can be locked to it, &
B & E, then move together, parallel with the axis of C.
The adjustable tappets A. A. on the planing machine table, strike the plate E,
or pin B, and also the reversing lever D, thereby reversing the machine, and
revolving C, by the forward and backward stroke of the table respectively.
The adjustment of B. in E, causes B, to receive its impulse from the tappets A. A.
sooner or later, according to the position of B. in relation to A. A. and thereby
increases or diminishes the travel of B, and consequently the rotation of the
grooved cam C, which latter is revolved, as described above, by B. acting against
the edges of the helical groove in C.
On the end of C. there is a wheel F, which drives the vertical shaft G. through
a suitable train of gearing, and a ratchet pawl and wheel H, to give the necessary
rotation to the said shaft G, at the end of the return stroke of the machine.
G, is connected to the cross-slide of the machine, by suitable gearing, for putting
on the feed, but the cross-slide is not shown upon the drawing.
In a similar manner, the automatic feed motion, can be applied to the side tool-
boxes of planing machines, by connecting the feed screws, by suitable gearing to
the wheel F.
Sheet 2. also shows the general arrangement of our improved feed mechanism, as
applied to an ordinary planing machine, but in this case the grooved cam C, is
actuated by a system of levers and rods, coupled to the reversing lever D, of the
machine; thereby giving a positive travel to B, & E, irrespective of the variable
travel (or over-run) of the table, when the machine is reversed.
On Sheet 2, Fig. 1. is an "end elevation," Fig. 2. is a "Bide elevation," Fig. 3.
is a "plan," & Fig. 4. is a "plan" of the grooved cam C.
In the arrangement as shown upon Sheet 2, the adjustable tappets A. A. strike
the reversing lever D, thereby reversing the machine, and actuating the lever 1.
through the connecting rod J. which lever moves the plate E, carrying the pin B,
which works in the grooved cam C, above referred to, & thereby revolves C, & the
wheel F, and thus actuates the feed mechanism, all as described above under
description of Sheet 1. The adjustment of the feed is obtained, by moving the
connecting rod J, in the grooves or slots of D, or I, respectively.
The grooved cam C, with its actuating pin B, plate E, and wheel F, can be
applied to any machine, where the necessary moving parts, such as A. A, are
present, to set them in motion.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is performed, we declare, that what we
claim is.
:―
First The combination of a grooved cam of helical form, actuated by a pin in
a plate, travelling parallel with the axis of the cam, for the purpose of revolving
it, this cam driving the feed mechanism of machines for cutting metals, sub-
stantially as herein before described, and illustrated, in the drawings annexed.
Second-The right to apply, our improved feed mechanism, as herein before

page_text: described and illustrated, to any kind of machine for cutting metals; where the
parts are suitable for such application.
Dated this Seventeenth day of May 1893.
JOHN FREDERICK ROBINSON.
GEORGE OLDFIELD.