FOR GIN-SAWS
Year: 1887

page_text: Date of Application, 12th Aug., 1887.
Specification Accepted, 20th Sept., 1887.
I, ROBERT FERRIDAY SPANGENBERG, Cotton Broker, of the Parish of Orleans, in
the State of Louisiana, United States of America, do hereby declare the nature of
my invention for a BRUSH FOR GIN-SAWS, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
For many years after the discovery of the cotton-gin the doffing or cleaning brushes
were located in such relationship to the saw-disks that the bristles interposed in the
path of the disk-peripheries would lie in planes substantially parallel to the disk-
surfaces. The disadvantage of this arrangement is due to the fact that the bristles
immediately in front of the disks and those directly adjacent thereto are in a com-
paratively short time either broken off or given a permanent inclination in opposite
directions outside of the range of effective action. It has been proposed to obviate
this defect by locating the brushes upon directly opposite sides of the several disks, so
that the bristles should extend at or nearly at right angles to the disk-surfaces and in
contact therewith. Aside from the difficulty of establishing and maintaining the
proper adjustment of the bristle ends with respect to the disk-surfaces, this construction
had the further disadvantage that the opposed bristles, acting simultaneously on
opposite sides of the disks, had a tendency to mutilate and tear the fibre of the cotton,
thereby deteriorating it and lessening its value.
It is the object of my invention to substitute for these old forms of brushes a
construction obviating their defects, removing the fibre from the saws in substantially
the same condition as when extracted from the burrs, completely cleaning the saw-
teeth at each revolution, and maintaining its efficiency for a great length of time.
With these ends in view I have devised the means illustrated in the accompanying
drawings, wherein―
Figure I represents a front elevation of my improved brush as applied to ordinary
gin-saws. Fig. II represents a side elevation thereof, and Fig. III represents an
enlarged fractional perspective view of the same.
Similar letters of reference indicate similar parts throughout the several views.

page_text: A indicates an ordinary cylinder having a series of saw-disks, E. B indicates a
brush-cylinder constructed in accordance with my invention, and consisting of a
central shaft upon which are suitably supported a series of lags, C, longitudinally
recessed at D for the reception of the bristle H I. These bristles are placed at an
incline, as shown in Figs. I and III, so that their outer portions, G, will with their
sides sweep the 'saws, their inclination keeping, them constantly pressed against the
saw-surfaces.
All of the series of rows of bristles H are inclined in one direction, while the
alternate series of rows, I, are inclined in the opposite direction.
It will be readily seen that in the operation of my invention the brushes act
alternately upon opposite sides of the saw-disks, thereby successively loosening and
disengaging the fibre from the saw-teeth without breaking or tearing said fibre.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed, I declare that what I claim is :-
1. The combination, with gin-saw disks, of a brush provided with a series of bristles
sweeping one side only of the several saw-disks and a second series of bristles sweeping
the opposite side only of said disks, the members of each series being located one in
advance of the other in the direction of the rotation of the brush and alternating with
those of the other series, substantially as described.
2. The combination, with gin-saw disks, of a brush provided with alternating series
of rows of longitudinally-disposed bristles, the bristles of one of the series being
inclined in one direction with respect to the brush-axis and the bristles of the other
series being inclined in the opposite direction thereto, substantially as described.
3. A brush for gin-saws, consisting of the cylinder B, provided with the lags C,
longitudinally recessed, and the alternate series of oppositely-inclined bristles H I,
the whole arranged so as to alternately sweep the opposite sides of the saws,
substantially as described.