Improvements in Meat Mincing Machines.
Year: 1888

page_text: COMPLETE SPECIFICATION..
'
Improvements in Meat Mincing Machines.
I, ROBERT DAVIDSON WADDELL of Mount Street, Glasgow, in the County of
Lanark, North Britain, Sausage 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 :—
1
This Invention relates to Improvements in Meat Mincing machines and has for its
object the increased efficacy and simplicity in the working of the same.
The accompanying drawings illustrate the Improvements constituting my Invention
as embodied in a rotary meat mincing Machine. Fig. 1. being a vertical section
taken on the line A. B. Fig. 2; Fig. 2 is a plan, and Figs. 3, 4, 5, 6, 7, 8, 9, being
details drawn to an enlarged scale for the better illustration of certain of the parts.
In carrying out the objects of this Invention a shaft C carried in pillow blocks on
the top of the framework D of the machine, has fitted upon it a knife holder E,
baving four or more knives or cutting blades e, e¹, e³, & e upon its periphery, the
shaft being rapidly rotated from any convenient shaft overhead by a belt pulley F.
A flywheel G is keyed to the cutting shaft C to regulate its motion.
A fan His slowly rotated from the cutting shaft C by belt pulleys and worm
gearing the pulley I on the shaft J, which is carried in journal bearings in the lower
part of the framework D, being driven by a belt from the pulley Q, whilst a worm
screw K situated about the centre of the shaft J gears with a worm wheel L on the
vertical shaft M. 6 is the usual guide for directing the meat in the pan H, towards
the cutting blade e, e¹, e, & e³. The knife-holder E may be made either in the form
of a plain solid disc as represented in elevation and plan at Figs. 4 & 5 respectively,
or, for the purpose of reducing the weight of the said disc, it may be made as
represented at Figs. 6 & 7, where on each side, about two-thirds of the thickness of
the disc is cut off to the extent of nearly half the diameter on opposite sides of a
D

page_text: central line, a boss being left round the shaft. For the reception in the plain solid
disc of the four knives or cutting blades e, e¹, e³, & e³, two recesses are cut on each
side of the said disc, each pair of recesses being of unequal depth and arranged to lie
at right angles to each other. The depth of these recesses is such, that when in
position the knives are set at equal distances apart, the outer surface of each of the
knives e&e being flush with its respective side of the disc, whilst the two inner
knives e¹ & e, are sunk to a considerable distance below the surface, this intervening
space being filled up by a distance plate f. The knives e, e¹, e³, & e³ instead of being
set radially from the centre of the disc E, are set somewhat higher, so that they make
a more obtuse angle with the knife-plate N, than formerly, thus giving the knife more
of a slicing motion when passing through the slits than hitherto experienced with
machines of this class. As it is necessary to keep the extreme cutting edge of the
bent portion of the knives at a constant distance from the centre of the shaft C, so
that the circle described by it when revolving always coincides with the arc of the
inner surface of the pan H, a slotted hole g is made in each knife to allow for its
longitudinal adjustment as it gets worn. Each knife, and when required its distance
piece f, is secured to the disc E by means of a bolt h which passes through the before-
mentioned slotted hole g in the knife. The head of the bolt h is square and fits into
a recess in the disc, whilst a large washer is placed over the slot holes in the outer
knives e & e³ to cover the same. By this arrangement, as the only parts that project
beyond the sides of the disc are the large thin washers and nuts of the bolts h, the
disc and knives can be more easily kept clean than has been hitherto attainable where
the knife-holder has been made either in-the form of arms, or of a double disc with a
space between. The disc E also makes a more rigid holder and a better guide for the
knives than is made by the usual arms, thus allowing the knives to enter narrower
slits in the knife plate N than has been hitherto accomplished, and consequently
cutting the meat into smaller particles than is usual with machines of this class.
It can be easily seen from Figs. 6 & 7 that the outer surfaces of the knives e, e', e³,
&e are all flush with their respective sides of the disc, so that no distance pieces are
required, but otherwise the knives are set to the same angle and similarly secured as
already described for the plain solid disc. Instead of fixing the knife plate N to the
framework D of the machine with bolts as heretofore, I prefer to make it in the form
of a slide, by bevelling the longitudinal edges as shown in elevation at Fig. 8 and
fitting the knife plate N between the corresponding bevelled portions of two fixed
pieces k. The knife plate N is prevented from being pushed too far forwards by two
downward projecting snugs which bear against the framework D, of the machine,
whilst it is securely fixed from being driven outwards by screwing down the nut m of
the eye-bolt n. This eye-bolt n is pivoted at o on the underside of a shelf which forms
a portion of the framework D, so that when not in use the eye-bolt n hangs downwards
and does not in the least obstruct the operations of the knife cover P. I prefer also to
insert a piece of wood p between the knife plate N and framework D of the machine,
the said wood plate p having its longitudinal edges similarly bevelled to those of the
knife plate N and the corresponding edges of the fixed pieces bevelled to suit. The
wood plate is tightly fitted into its place and is made long enough to project slightly
beyond the outer end of the slits of the knife plate N, so that the knives, when
revolving, cut into the wood, thus entirely preventing any of the meat from being
pushed through the usual space at the outer end of the slits i, and carried round the
cover back into the pan. Two set pins q which pass through the snugs are used to
keep the wood plate p up to its work as it gets worn. With the introduction of this
wood-plate p my invention will combine the hitherto unattainable excellence of a
chopping machine with that of a silent rotary one. It is to be understood however
that I do not confine myself to use the said wood plate p as the machine may be made
with or without it. The knife cover P may be pivoted at the pin and a slot so cut
out of the arms & that the cover P may be easily removed altogether or turned over
into the position represented at Figs. 1 & 2 without falling off. I prefer however to
have the cover P secured to the knife plate N by two studs t, as shown at Fig. 3. and
this arrangement is especially applicable to shops or where space is limited.
P

page_text: Having now particularly described and ascertained the nature of my said
Invention & in what manner the same is to be performed, I declare that what
I claim is :-
First. In meat mincing Machines the knife-holder E whether in the form of a plain
solid disc, or one having a zigzag section substantially as hereinbefore described and
for the purpose specified with reference to the annexed drawings.
Second. The construction of the knife-plate N the method of fixing the same, and
its arrangement in relation to the fixed pieces k, with or without the wood plate p
substantially as hereinbefore described with reference to the annexed drawings.
Third. The method of fixing the knife cover P to the knife plate n by means of
studs t substantially as described with reference to Fig. 3. of the accompanying
drawings.
Dated this 5th dove as Desemba 1000
D. DRYSDALE AUSTIN,
Applicant's Agent.