IMPROVE- TED THREAD CUTTING "
Year: 1867

page_text: LETTERS PATENT to Milton Hamer, of Manchester, in the County of
Lancaster, India-rubber Manufacturer, for the Invention of "IMPROVE-
TED THREAD CUTTING
"
PROVISIONAL SPECIFICATION left by the said Milton Hamer at the
Office of the Commissioners of Patents, with his Petition, on the
7th August 1867.
I, MILTON HAMER, of Manchester, in the County of Lancaster, India-
rubber Manufacturer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN MACHINERY FOR INDIA-RUBBER THREAD CUTTING," to be
as follows:
My Invention relates to those machines in which the india-rubber is caused
to revolve while a cutting tool advances, retreats, and is traversed: so as to
sever successive strips of the 'material, and consists,-
Firstly, in causing the said cutting tool to advance at an accellerated.speed,
in order to effect which I'employ a cam of increasing radius, which cam acts
upon suitable rods and levers connected to the sliding frame which carries the
cutter. The above-mentioned rods or levers which connect the cam to the sliding
frame I make adjustable, whereby the said cam may be made to vary in action.
Secondly, my Invention relates to self-acting apparatus for causing the
ver to tr
traverse for 'successive cuts. To effect this I employ a cam which
gives-motion through the medium of rods or levers to one of two plates, the
cutter
.

page_text: one loose and the other fast upon the traversing screw. The former of these
plates carries short levers capable of turning upon centres in one direction.
When they are moved forward to prepare for a traversing by the screw they
slip over the other plate, but when they are moved in the other direction they
bite or clip its surface and thus cause the screw to revolve. The length of
feed can be regulated by shifting the centre of motion of a lever connecting
the aforesaid cam to the revolving plates.
Thirdly, my Invention relates to a method of adapting the cutter for
different thicknesses of material. For this purpose I render the said cutter
adjustable by a screw, which I propose to mount in a nut capable of swivelling
in the lever, by which the said cutter is forced forward.
SPECIFICATION in.. pursuance of the conditions of the Letters Patent, filed
by the said Milton. Hamer in the Great Seal Patent Office on the
7th February 1868.
TO ALL TO WHOM THESE PRESENTS, SHALL COME, I, MILTON
HAMER, of Manchester, in the County of Lancaster; India-rubber Manir-
facturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria by Her Letters
Patent, bearing date the Seventh day of August, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirty-first year of Her
reign, did for Herself, Her heirs, and successors, give and grant unto me,
the said Milton Hamer, Her special license that I, the said Milton Hamer,
my executors, administrators, and assigns, or _ such., others as I, the said
Milton Hamer, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
MACHINERY FOR INDIA-RUBBER THREAD CUTTING," upon the condition, amongst
others, that I, the said Milton Hamer, by an instrument in writing under.
my hand and seal, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed, and cause
the same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Milton Hamer, do hereby declare
the nature of my said Invention, and in what manner the same is to be per-

page_text: formed, to be particularly described and ascertained in and by the following
statement and accompanying Drawings, that is to say:
My Invention relates to those machines in which the india-rubber is caused
to revolve while a cutting tool advances, retreats, and is traversed so as to
sever successive strips of the material, and consists,
"
Firstly, in causing the said cutter to advance at an accellerated speed,
Secondly, in an arrangement of self-acting apparatus for causing the cutter
to, traverse for successive cuts.
Thirdly, in a method of adapting the cutter for different thicknesses
material.
2
In the accompanying Drawing, Fig. 1 represents in plan view an india-
rubber cutting machine constructed according to my improvements; Fig. 2 is
an end view thereof; and Figs. 3, 4, 5, 6, 7, 8, detached views of certain
parts.
At 1 is the bed of the machine, similar to an ordinary lathe bed, and
supposed to be continuous for the support of a series of machines. Upon this
bed are mounted the usual centres 2 which carry the drum 3, on which is
placed the india-rubber 4 intended to be cut, it being wound thereon in layers,
as is ordinarily practiced. The driving speed pullies for the slide rest are at 5,
the shaft of which carries a worm 6 taking into a wheel :7 mounted on a
shaft 8, and at the other end thereof is a bevil 9 taking into another 10 which
is loose upon the shaft 11, but capable of driving the said shaft through the
medium of a clutch 12 sliding upon a feather. Upon the shaft 11 is a cam 13
capable of acting against one end of a lever 14, 14*, turning upon a centre 15.
The end 14 of this lever is jointed to a rod 16, which at its upper end is
connected to a lever 17 fixed to a shaft 18. This shaft carries an arm 19
mounted so as to be capable of sliding thereon, but of receiving motion by
the vibration of the said shaft by means of a key situate in a longitudinal
groove 20. The arm 19 is formed with a jaw, which embraces a collar 20
on a screw 21 situate in a nut 22 carried by the moveable part 23 of the slide
rest which carries the cutter 24, and the said nut is mounted on a centre 25,
so as to be capable of swivelling. Motion having been communicated to the
machine, and the clutch 12 having been put. into gear, the shaft 11 will be
caused to revolve, and the cam 13 thereon acting against the lever 14 will
cause it to turn upon its centre 15, by which means the other end thereof will
be forced upward, so as to cause the shaft 18 to turn a portion of a revolution
through the medium of the lever 17. This movement of the shaft 18 will
carry with it the arm 19, it being connected thereto, as before mentioned, by
a key situate in the groove 20, and by these means the screw 21 will be

page_text: forced forward, carrying with it the sliding part 23, and thus the cutter 24
will be caused to advance into the cylinder of india-rübber which is driven by
the ordinary pulley 26. It will thus be seen that the part which regulates
the advance of the cutter is tlie cam 13, the periphery of which by bringing
increasing radii to bear upon the lever 14 effects an accellerated speed of the
cutter as it advances through the material, and this accelleration may be
varied at pleasure by altering the form of the cam. During the operations
above described the lever 14 has been kept against the periphery of the
cam 13 by a rod 27, which is borne upward by a weighted lever 28, and
when a cut has been effected, and the prominence of the said cam has passed
the lever 13, then the weighted lever 28 will cause lever 14 to turn back upon
its centre 15 and reverse the motion of the shaft 18, whereby the arm 19
acting upon the screw 21 will withdraw the sliding piece 23 and cutter 24
into the position shewn. The centre of motion 15 is adjustable in a slot 29,
and by being shifted therein greater or less leverage may be employed so as
to suit the motion of the cutter to different thicknesses of material to be
severed, a tightening screw being employed for the purpose of fixing the saíd
'centre of motion. An accurate adjustment to compensate for wear of the
cutter or other cause may be obtained by turning the pulley handle 31 on 'the
screw 21" which is mounted loose in the 'collar 20.
1.
The method by which I cause the cutter to traverse is 'as follows; referelice
being had to the general views, and to the detached views, Figs. 4, 5, 6, and 7,
the last two of which are drawn upon an enlarged scale.Upon' the shaft 11
is a cam 32 bearing against a lever 33, 33*, which turns on a centre
34, the
lower part of 33* being connected by a link 35 to à bell-crank lever 36, 36,
'furnished with a toothed segment 37 in gear with a pinion 38 mounted loosely
on the axis of the screw 39; which causes the slide rest and cutter to traverse.
Fast with the pinion 38 is a disc 40 furnished with three projecting studs 41,
which constitute centres of motion for nippers 42 bearing at one end against
á boss 43 fast upon the screw axis 39, and drawn thereto by means of india-
rubber or other springs 44. In order to avoid confusion one only of these
nippers is shewn in Fig. 6. At 45 is a screw provided with à projection 46
guided by a slot 47, and which may be regulated in position by turning the
nut 48. The lever 33 is constantly-borne. towards the cam 32 by a rod. 49
acted upon by a weighted lever, not shewn in the Drawing, but the same as
that referred to in reference to the other cam 13. During the advance of the
cutting tool into the india-rubber the cani 32 by revolving in the direction of
the arrow turns the levers 33, 33*, and 36, 36*, so as to move the segment 37
in the direction of the arrow thereon; this will give motion to the pinion 38

page_text: and disc 40, and the clips 42 will therefore be carried bodily forward in the
direction of the arrow, but as the said clips will when moved in that direction
be free to turn upon their own centres they will simply slide over the surface
of the boss 43, and will not impart motion thereto; but when a strip has
been severed and the cutter has retreated, then the prominence of the cam 32
will leave the lever 33, and the weighted rod 49 will cause the said lever to
turn upon its centre, so as to move the segmental rack 37 in the opposite
direction to that above described, the consequence of which will be a reversed
motion of the disc 40 and nippers 42, and these not being at liberty to turn
upon their own centres when moving bodily in that direction will nip the
boss 43 and carry it with them, thereby turning the screw 39 and causing the
cutter to advance for another cut. When these movements take place
the lever 36 arrives in contact with the adjustable stop 46, so that the motion
of the segment 37 is arrested, and this may be altered by means of the nut 48.
In order, however, to determine exactly the position of the cutter a dividing
plate 50 is placed as usual upon the screw 39, which dividing plate is held by
a tooth projecting from a lever 51, and drawn towards the said plate by an
india-rubber or other spring 52.
Having thus described and ascertained the nature of my said Invention,
and the manner in which the same is to be performed, I desire it to be under-
stood that I claim as secured to me under the above in part recited Letters
Patent, and in reference to the above-mentioned description of machinery,-
Firstly. Causing the cutting tool to advance at an accellerated speed.
Secondly. The apparatus substantially as described for traversing the cutter.
Thirdly. Rendering the cutter adjustable by means of a screw, as illustrated
at 21..
In witness whereof, I, the said Milton Hamer, have hereunto set my
hand and seal, this Sixth day of February, in the year of our Lord
One thousand eight hundred and sixty-eight.
M. HAMER
(L.D.)