Improvements in Milling Machines for Engraving Plates or Cylinders, and for Forming Plates for Stencils to Produce Drawings, Writings, and the like.
Year: 1893

page_text: Date of Application, 27th Jan., 1893-Accepted, 21st Apr., 1894
COMPLETE DEVIFICATION.
Improvements in Milling Machines for Engraving Plates or
Cylinders, and for Forming Plates for Stencils to Produce
Drawings, Writings, and the like.
I, WILLIAM PATERSON of Phoenix Works, Maryhill, Glasgow, in the
County of Lanark, North Britain, Chemical Manufacturer, 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 has reference to and comprises a new or improved arrangement
and combination of the parts of a machine or mechanism, whereby a series of two
or more metallic "mills" or milling tools are fitted to act at one time to engrave
the surfaces of the cylinders or flat plates with checked lines specially suitable for
making engraved metallic plates for forming stencils to produce copies of drawings
writings and the liko of a uniform and finely engraved character.
But in order that my said invention may be more readily understood and easily
carried into effect I will proceed to describe the same with reference to the
accompanying drawings.
Figure 1 is a front elevation and Figure a cross section of a milling machine
constructed in accordance with my said invention.
Figure 3 is an elevation of one of the milling tools.
The improvements consist in erecting, or fitting a vertical, curved or straight
standard A on the horizontal traversing table B of the milling machine. The
said standard A is provided at its top end with an adjustable eye or bearing a in
which is mounted a horizontal longitudinal spindle Cupon which is mounted a
series of two or more parallel weighted levers D and milling adjustable frames E
each carrying a "milling" tool F, Figuro 3. These levers D are mounted by
sockets and eyes or collara d at their one end on the fixed horizontal spindle C and
can be shifted or adjusted longitudinally on same, and held in any desired position
by collar rings o mounted on the spindle on one or both sides of the lever collars d
and fitted with adjustable screws o'. These lever eyes d although held in position
longitudinally are free to oscillate round the spindle C. The frames E carrying
the milling tools are preferably formed of square shaped plates secured together
and mounted adjustably on one of the weighted levers D. The milling tools F.
which consist of rollers with the centre part previously "milled" or cut are
each mounted by end journals ƒ' under each of their carrying frames E and held
in position by a piece of cord G tied round them and the frames E or by spring
or other clips. When a oylinder H is to be engraved it is preferably mounted in
sectional parts over an inner cylinder h which is mounted by end collars h¹ and
adjustable screws or clamps A on a longitudinal spindle J working in bearings ; in
the end vertical standard frames of the machine. This spindle J is rotated by
spur wheel or other gearing K, at one of its ends primarily driven from any over-
head shaft. While the screw spindle L on which the travelling table B carrying
the mill supporting framo standard A is mounted is also rotated by reducing spur
wheel gearing M in time unison with the former to give a longitudinal traverse to
the "milling "tools F. As the sheet steel or other metal cylinder I to be
"milled or engraved is rotated the milling tools F are brought down by the
levers D which have heavy weights N placed on their free ends to make the
tools F bear on the surface of the cylinder H and they simultaneously all work
together over separate sectional or divisional parts of the cylinder H to "mill"
or engrave same as they are rotated by the revolving surface contact of said
"

page_text: -cylinder. I while they receive their longitudinal traverse from the screw spindle L
carrying the travelling tablo B.
-66
When flat instead of cylindrical plate work is to be “milled” or engraved the
milling" tools are mounted in a position at right angles to that previously described,
and brought down to act on the surface of the flat plate which would be mounted
over a horizontal table.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what 1
.claim is :-
The improvements in milling machines for engraving plates and cylinders; and 1
for forming plates for stencils to produce drawings, writings and the like, substan-
tially, as horeinbefore described and shown in the accompanying drawings.
Dated this 25th day of January 1893.
J. Y. JOHNSON,
116, St. Vincent Street, Glasgow, Applicant's Agent.