Improvements in Milling Machines.
Year: 1890

page_text: Date of Application, 4th Mar., 1890-Accepted, 12th Apr., 1890
COMPLETE SPECIFICATION.
Improvements in Milling Machines.
I, CHARLES HENRY TRASK, of 44 Cherry Street in the City of Lynn, in the County
of Essex, and State of Massachusetts, United States of America, Gentleman 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:
The invention relates to a milling machine arranged to simultaneously and auto-
matically form the back-off, so called, of a number of rotary tools or cutters, and it is
represented as embraced in an organization consisting of a number of milling tools or
cutters arranged upon parallel shafts and a number of arbors mounted below the shafts
carrying the milling tools upon which the tools or cutters to be shaped by the milling
tools are mounted in gangs, and which arbors are caused to be rotated and are
supported to provide them with a movement toward and from the milling tools or
cutters at predetermined intervals, and at any desired speed in relation to the degree
of their rotation, and with any desired extent of movement in relation to said milling
tools by means of the suitable operating devices hereinafter specified.
The invention further relates to the means of adjusting the arbors and the
mechanism for operating the same as above indicated whereby the variation in the
speed of their rotation in the time of their movement in relation to the milling tools,
and in the extent of such movement is varied. It will be understood of course that
after the adjusting devices have been set to cause the arbors to rotate and move as
required, that the operation of the machine is automatic, that is, the blocks or discs
mounted upon the arbors are subjected simultaneously to the action of the milling
tools whereby one tooth in each block or disc is backed off by the simultaneous advance
of all to the milling cutters or tools and their rotation in relation to said milling cutters
or tools, the said blocks or discs are then dropped automatically and advanced again
for the purpose of backing off the second tooth in order, and these movements con-
tinue until the teeth of each block or disc have been backed off.
In the accompanying drawings,

page_text: blanks to be operated upon, 64 65 66 67 (see Fig. 4) there being a tool blank for each
of the various groups of milling tools a¹ as a a'. Each arbor has at one end a worm
wheel, the arbor 6 having the worm wheel 68, the arbor 6 the worm wheel b³, the
arbor the worm wheel 610, the arbor 63 the worn wheel 611, and each of these worm
wheels is engaged by the long worm 12 (see Fig. 3) which is formed upon the
shaft 613 having suitable bearings in the arbor box or frame B, and is rotated by means
of the gear 614
upon the shaft 613, and the gear 616 upon the shaft 616 (see Figs. 3
and 4). The shaft 616 has suitable bearings in the frame A¹ of the machine and has a
worm wheel 67 (see Fig. 3) which is engaged by the worm 618 upon the shaft A (see
Fig. 5). The shaft A is the one upon which the pinion as driving the milling tool
shafts a a¹ a² a³ is mounted. The shaft 16 also carries the cams CC' (see Figs. 3, 8,
and 5). These cams are shaped or constructed substantially as represented in Figs. 6
and 8, and they serve to communicate vertical movement to the arbor frame B, arbors
carried thereby, and the tool blanks. This movement is imparted, to the arbor
frame B, through the slide arms cc¹, the lower ends of which bear upon the cams CC¹
respectively, and which extend downward from a table c² (see Fig. 8). This table
moves in the dovetail guide sections c3 c on the frame A¹ (see Figs. 3 and 9). The
slide arms c c¹ not only bear on the cam and impart vertical movement to the table c²,
but they are secured or attached to the table by a horizontal dovetail construction
(see Figs. 4 and 8) which permits them to be moved towards and from each other by
means of the right and left screw threaded shaft c, the right threaded section of the
shaft extending into the threaded hole of one slide arm and the left threaded section
of the shaft into a threaded hole of the other slide arm. This movement is given the
slide arms c c¹ for the purpose of adjusting the time of the elevation of the table c² and
the arbor support B. Of course this movement of the slide arms towards and from
each other would not effect this vertical adjustment unless the arms were shaped upon
their lower ends as represented in Fig. 8 to any desired angle or inclination to a
horizontal line and the cams were also provided with an inclined surface of similar
angle whereby upon the movement of the slides upon the cam surfaces towards each
other the table c is lowered, and away from each other the table is elevated. The
table 2 has provision for changing the elevation of the bed D upon which the arbor
frame or support B rests. This is effected by means of the wedge adjusting blocks d d'
(see Fig. 5) and the right and left threaded screw shaft d2 which actuates the wedge
blocks d d to move them towards or from each other. These wedge blocks extend
into wedge guiding recesses d³ d in the tops of the dovetail projections c3 c4 extend-
ing upwards from the frame A¹ (see Figs. 3 and 5) and bear upon the inclined
bottoms d5 d of said recesses. The table 2 also carries a threaded shaft d³ which
passes through a nut formed in the section d' of the bed D by means of which the
bed D and the arbor support are moved horizontally in relation to the bed c² (see
Fig. 8). The arbor support or frame B is secured to the bed D in any of the well.
known ways.
These adjustments, namely, the vertical adjustment and the horizontal adjustment
are provided for the purpose of bringing the work, namely, the tool blanks 64 65 66 67,
into proper relation to the milling tools before the machine is started, and also for the
purpose of providing means whereby tool blanks varying in size or diameter may be
operated upon. After the proper adjustments, the automatic operation of the machine
is practically confined to the rotation of the milling tool, the rotation of the arbors and
tool blanks carried thereby, and the vertical movement of the tool blanks in relation
to the milling tools due to the operation of the cams CC. The tool blanks, and con-
sequently the arbors and the arbor frame, are given as many vertical movements in
relation to the milling tools as there are teeth in the tool blanks to be backed off, for
instance, if it were intended to provide each of the four groups of tool blanks with
fifteen teeth, then the tool blanks would be moved upward and downward fifteen times
in relation to the milling tool, the rotary movement of the tool blanks continuing of
course during these movements. To vary the number of vertical movements to each
full revolution of the various tool blank arbors the gears 614 615 are changed for others
of the necessary size,

page_text: It will be observed that each tool blank is provided with a vertical movement in
relation to its shaping willing tool, and also with a slow rotary movement the upward
vertical movement continuing during the backing off or removing of a section of the
edge of the tool blank, and forming upon the edge of the tool blank a rounded or
curved surface which extends from its edge inward tangentially to any desired extent
according to the number of teeth which the tool blank is to have, and the cams C C³
are shaped to cause or permit a quick return or downward movement of the tool
blanks, and arbor support, upon the completion of the backing off of each tooth, but
the slow rotation of the arbors is not stopped. The effect of this operation is to
produce upon each tool blank a series of curved recesses e (see Fig. 12). The position
which the milling tool bears to the tool blank at the beginning of the shaping operation
is represented in Fig. 10, and at the end but before the drop or downward movement
of the tool blanks in Fig. 11.
The vertical adjustment by means of the slide arms c c is for the purpose of varying
the extent of the drop or vertical movement of the arbors and tool blanks in relation
to the milling tools; the second vertical adjustment or that obtained by the wedge
blocks d d is for the purpose of enabling tool blanks varying in diameter to be
worked in the same machine. It will be observed that by this mechanism a large
number of tool blanks are simultaneously operated upon and that the backing off or
forming of each tool blank proceeds automatically and continuously, and that the
backed off tool blanks are very accurately and cheaply produced.
To lubricate the milling tools I have arranged in the frame over the tools a
depressed section which forms an oil pan or holder E, which is provided with holes e¹
over the milling tools, so that the oil feeds from the reservoir or holder directly upon
the tool.
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 I
claim is :-
1. The combination in a milling machine of one or more gangs of milling tools, one
or more rotating arbors supporting a gang of tool blanks and presenting them to the
milling tool, support for the arbor or arbors, and a cam for providing the arbors
with vertical movements in relation to the milling tools or cutters, substantially as
described.
2. The combination in a milling machine of one or more gangs of milling tools, one
or more rotating arbors supporting a gang of tool blanks and presenting them to the
milling tool, support for the arbor or arbors, a cam for providing the arbors with
vertical movements in relation to the milling tools or cutters, and an adjusting screw
or device for moving the arbor support horizontally in relation to the milling tools or
cutters, substantially as described.
3. The combination in a milling machine of one or more gangs of milling tools, one
or more rotating arbors supporting a gang of tool blanks and presenting them to the
milling tool, support for the arbor or arbors, a cam for providing the arbors with
vertical movements in relation to the milling tools or cutters, and vertically adjustable
arms interposed between the clamp and the arbor support whereby the time of the
action of the cam is varied, substantially as described.
4. The combination in a milling machine of one or more gangs of milling tools, one
or more rotating arbors supporting a gang of tool blanks and presenting them to the
milling tool, support for the. arbor or arbors, a cam for providing the arbors with
vertical movements in relation to the milling tools or cutters, and adjusting wedges or
devices interposed between the arms or connections bearing immediately upon the
cam, and an arbor support whereby the support is made vertically adjustable
without moving the supports or arms which bear on the cam, substantially as
described.
5. The combination of one or more gangs of milling tools with the oil receptacle E
having the holes e¹, substantially as described.
6. The combination of one or more gangs of milling tools or cutters, one or more

page_text: rotary arbors for supporting a gang of tool blanks and presenting them to the milling
tools or cutters, the arbor support B having a horizontal movement and also a
vertical movement in relation to the milling tools, substantially as described.
7. The combination in a, milling machine of one or more gangs of milling tools or
cutters, one or more rotary arbors for presenting one or more gangs or groups of tool.
blanks to the milling tools, the arbor support, cams with tapering or cone surfaces for
providing it with a vertical movement through interposed supporting mechanisin, and
said mechanism comprising a vertically movable table having horizontally movable
arms having ends of the same inclination as the cums, a bed carried by the table and
movable vertically in relation thereto by adjusting wedges, and the arbor support
mounted upon the bed and horizontally movable thereon by means of an adjusting
screw, substantially as described.
8. The combination in a milling machine of the milling tool or tools, the arbor
support having vertical movements, one or more arbors carried thereby, each of which
has at one end a worm wheel, a worm to engage said worm wheel or wheels, a
gear mounted upon the cam shaft and a positively actuated gear 615 to engage the
gear 6 substantially as and for the purposes specified.
9. The combination of the pinion a8 upon the shaft 616, the gear a, the gears a⁰ all,
the shafts a, a, a², a³ carrying gangs of milling tools, the cams C ( shaped as specified
and mounted upon the shaft 16, the worm wheel 67 upon said shaft engaged by a
worm on the shaft 1,18 the arbors mounted upon the arbor support B, their worm
wheels, the worm shaft 3, the worm of which engages said worm wheels, the
gear on the worm shaft, and the gear on the cam shaft 616, substantially as
described.
Dated this 20th day of Fahu 1800.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant..