Improvements in Gin-saw Filing Machines.
Year: 1899

page_text: Date of Application, 7th Mar., 1899-Accepted, 10th June, 1899
Improvements in Gin-saw Filing Machines.
I, ALBERT ALONZO WOOD, of 201, Jackson Street, in the City of Atlanta, State of
Georgia, United States of America, Mechanical Engineer, 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 relates to devices for sharpening the saws of cotton gins, by filing
the teeth from base to point and bringing the points to sharpness whereby the teeth
are brought from a worn condition to their original condition.
The invention consists of the novel elements and combinations thereof as herein-
after set forth.
An understanding of the mechanism here shown, in some of its details, will be
facilitated by reference to my Application for Letters Patent for a gin saw gummer
No. 4999 A.D. 1899 filed of even date herewith.
The device in one of its forms is shown in the accompanying drawings as follows:
Figure 1 is a side elevation of the machine, showing it in position on a saw and
resting on the space blocks and a support.
In Figure 1, as will be seen, the mechanism has a general inclination, which is its
correct position when at work, but, for convenience in the following description views
on a plane through the axes of the shafts will be called "plans" and at a right angle
thereto "elevations," as if the axes of those shafts were on an horizontal plane. For
convenience, and to conform to the nomenclature usually employed by manufacturers
of this class of machinery, the part that rests on the space blocks will be called "the
stand" and the part that carries the shafts and most of the moving elements will be
called "the frame." The part that forms the hinged connection of the frame and
stand will be called "the hinging-piece."
Figure 2 is a plan of the frame and hinging-piece. This figure also shows the two
shafts and their geared connection and the crank that reciprocates the file, also, the
forward end of the feeding and retaining levers. The upwardly projecting bearing
carrying a part of the mechanism is not shown in this figure.
Figure 3 is an inverted plan of the frame.
Figure 4 is an end elevation from the left end, as shown in Figures 1 and 2, of the
hinging-piece and shows its connection with the stand, a small portion of which is
also shown in this figure.
Figure 5 is an elevation, from the back side, as shown in Figure 1, of the retaining
pawl and its connection, by a pulling coil-spring, to a semi-rotating shaft that passes
through the frame.
Figure 6 is a section on the line 6-6, Figure 1. A sub-section in broken lines,
on line 6 a, Figure 1, is also shown in this figure.
Figure 7 is a plan of the retaining-lever and its connection to a lug on the frame.
Figure 8 is a side elevation of the retaining-lever and the gear carrying the rollers
by which it is actuated.
Figure 9 shows the eccentrically connected stud on which the retaining lever is
pivoted,
aulan of the food laver

page_text: Figure 11 is a side elevation of the feed-lever and the pendulous arm, or link, to
which it is pivoted.
Figure 12 is a cross-section through the feed-lever and shows the pendulous arm,
the pin on which the arm is carried and, in section, the lugs through which the pin
passes.
Figure 13 shows the connection by which the feed-lever is connected with the
double crank on the larger of the two bevel gears.
Figures 14, 15, 16, 17, 18 and 19 are diagrams that, in connection with Figure 13,
show successive positions of the double crank that, in conjunction with the heart-
shaped opening in the connection, causes a complete stroke and return, of the feed-
lever to each half revolution of said crank.
Figure 20 is an enlarged elevation of one end of the frame, showing the files, the
file-carrier and its guide, the upwardly projecting frame-bracket on which the file-
carrier guide is reciprocably carried, the crank that reciprocates the files and its
connections with the file-carrier. The retaining-and feed-pawls are also shown in this
figure.
Figure 21 shows the shaft to which the file-carrier guide is adjustably attached,
and the arm to which is attached the spring that applies pressure to the file.
Figure 22 shows the tongue- and groove-connection of the arm that carries the file-
carrier guide, with the shaft shown in Figure 21.
Figure 23 is another view of the arm shown in Figure 21 and to which the file
pressure spring is attached.
Figure 24 is a detail of a part of the file-carrier, the pitman that connects it to the
crank and the guide on which it slides.
In Figure 1 the stand composed of the parts 1 and 2, is shown as resting on the
space-blocks 3 of a cotton-gin; the saw, 4, passing into a slit between the two parts.
The stand is further shown in Figures 4 and 6. In Figure 6 it will be seen that the
upwardly rising webs or flanges, 5 and 6¹, are beveled and present a cutting or
scraping edge to any lint and gum that often adheres to an old saw, and that would
otherwise clog the saw in the slit through which it is obliged to pass in being fed
around to be filed. It not being practicable, on account of the files passing in close
proximity, to place these flanges central to the parts 1 and 2, as is done on the bottom
half of the bifurcated portion of the stand, they are brought into immediate contact
with the saw and made, by reason of the cutting edges 7 and 8, to scrape the lint
and gum from the saw as it turns.
It will also be seen, by reference to Figure 6, that there is a journal-bearing box 10
on the stand for the shaft 11 of the arm 12, that connects the stand to the frame 14
as will be hereinafter described.
The frame is also connected to the stand by the hinging-piece 14 as shown in
Figures 1, 2 and 4. The hinging-piece 14 is attached to the stand by means of a
shoulder screw 15, and to the frame by the trunions 16, shown in Figure 3. Both
these connections are shown in Figure 1, and they are shown separately in Figures 2
and 4, and it will be also seen that the hinging-piece has a free hinge-movement
on both the trunions and the shoulder-screw. The arm 12 is pivoted to the frame by
means of a shoulder-screw 17, Figures 1 and 3. By reason of the hinging, or pivoting,
of the hinging-piece and arm 12 to both the stand and frame, the frame will have a
swinging movement toward and from the saw to permit the file 20 or 21 and the
bit 23, fastened on the end of the retaining-pawl 24, to adjust themselves to any
varying radius of the saw as it is being fed down and to move forward one tooth at a
time as often as the operation of feeding the saw occurs. The function of the
retaining-pawl is to hold, by its bit,' the frame of the machine so as to cause a corner
of the file to enter an interdental space, To adjust the space between the bit of the
retaining-lever and the file to suit saws of different pitch, the retaining-pawl is pivoted
on a rotatable stud 26, Figures 3, 7, 8 and 9, said stud entering into an horizontal
groove in the downwardly projecting lug 28 to prevent vertical displacement, and being
attached to said lug by a screw 29 that is tapped, eccentrically, into said stud and
passes through a vertical slot in said lug, as is best shown in Figures 8 and 9. It will

page_text: be seen that to partially rotate this stud, which may be done by its handle 30,
will not change the vertical position of the pivotal point of the retaining-lever, but
will, by reason of the eccentrically placed screw being in a vertical slot, change the
distance as required, between the bit 23 and the file that is operating on the saw.
The retaining-pawl is in the form of a lever, having a rearward extension that is
depressed by the passing of the rollers 33 or 34, on the bevel-gear 35, Figures 2 and 8,
which will lift the bit 23 out of an interdental space and allow it to pass to the next
space, and, with it, the frame carrying the file. The lifting of the file to allow it to
pass over a tooth and the stopping of the forward movement, just at the desired place,
will be hereinafter described.
The forward movement of the frame is produced partly by gravity, owing to the
inclination thereof, but mainly and more positively by the action of the spring 37
which is a pulling spring and is attached at one end to a stationary abutment when
it is to be merely used to cause this forward movement of the frame; or to the
retaining pawl 24, as shown in Figure 5, when it is desired to add the function of
depressing the said pawl, the lower end of said spring 37 being attached to an arm
or radial stud 38 projecting from a rotatable shaft 11 mounted in the stand and
passing through same; an arm 12 being secured to the end opposite the arm 38 as
shown in Figures 1, 5, and 6, and, projecting upwardly is secured pivotally to the
frame by a screw 17. Now it is obvious that a partial rotation of the shaft 11 will
swing the arm 12 forwardly at its upper end and carry with it the frame. In order
to keep the tension of this spring uniform whether the frame is at its highest or
lowest point of adjustment, and in so doing, to provide for an equable force exerted
on the frame and the retaining-pawl 24, the connection between the shaft 11 and
the arm 12 is made in the following manner: An arm 43 is set rigidly upon said
shaft projecting the same direction and distance as the arm 38 and to the end of
this arm, at a point equally distant radially from the shaft 11 as is the attachment
of the spring 37 to the arm 38, I attach, pivotally, the lower end of the arm 12 by a
screw 44, a segmental slot and screw 45 serving to make this pivotal connection rigid
at any point of adjustment.
The theory of this is, that the lower attachment of the spring 37 being at the
axis of the shoulder-screw 44 and the distance between said shoulder and the
shoulder-screw 17 being always the same, the distance between said lower attachment
of the spring 37 and its attachment to the retaining-pawl will always remain prac-
tically uniform; that is to say, the lower attachment of the spring will be raised
with the frame.
The feed-lever 50, Figures 1, 11 and 12, feeds the saw by means of a bit 51. It
is pivoted on the free end of the link, or pendulous arm, 52. The pendulous arm is
journalled on a pin 53, shown also in Figures 3 and 12. This pin passes also through
the lugs 54 and 55 projecting downwardly from the frame. It will be seen, by
reference to Figure 12, that a shoulder on this pin rests on lug 54 and that it does
not reach entirely through the lug 55, so that the screw 56 draws the shoulder on
the pin firmly against the lug 54 and prevents the accidental turning of the pin.
The middle portion a of the pin is eccentric and, as will be seen in Figures 11 and 12,
abuts against an upward projection 6 on the feed-lever 50. The feed-lever, when
in engagement with the saw by its bit 51, stops the forward movement of the frame,
carrying the retaining pawl and file, by the contact of the eccentric part a with
the upward projection 6; consequently the pin 53 should be turned by the handle 57
so that the eccentric part a will be in the position that will let the frame move
forward just sufficiently to carry the file and retaining pawl over one tooth. It
will hereafter be explained how the lifting of the retaining pawl from the interdental
space will cause the file to be lifted also.
The feed-lever is actuated by a double crank, consisting of two rollers on crank-
wrists 61 and 62, on the back of the gear 35, through the pitman 60 which is attached
to the feed-lever by an eccentric bushing 58. The turning of the eccentric
bushing 58 will adjust the feed-bit 51 to work between vibratory limits that will
bring the saw down only so much as will allow the retaining-pawl to pass over a

page_text: tooth when the bit 23 of the retaining-pawl is lifted by one of the rollers 33 or 34
on the gear 35 Figure 8. The gear 35 on the shaft 98, which is the hand-crank
shaft, being the most convenient element from which to transmit motion to the
feed-lever, and its rotation being only half as often as the saw requires to be fed
down, mechanism consisting of two radially opposite crank-wrists 61 and 62 preferably
provided with anti-friction rollers, on the back of the gear 35 operate in conjunction
with the modified heart-shaped opening in the pitman 60, to give the feed-lever two
strokes to each rotation of the said shaft 98 and revolution of the cranks. This
operation is illustrated in Figure 13 and in the diagrams Figures 14 and 19,
inclusive. In the diagrams only the rollers and the shaft 98 are shown in several
of the successive positions they pass in making a half revolution. A broken line is
drawn through the axes of the shrft in these views for use in comparing the diagrams
as to position of opening relative to said axis, in height. Before proceeding to a
description of the parts under immediate consideration attention is called to the
fact that were the opening in the connection of the ordinary form of a heart-cam,
that is to say, the three curved sides, forming it, being radial to the three corners, or
meeting points of the lines, a sufficient additional radius being allowed to provide
room for half the crank-wrist diameter, the entire up-stroke of the pitman 60 would
occur while the cranks were advancing from the position shown in Figure 14 to that
shown in Figure 16. From the position shown in Figure 16 to one midway between
the positions in Figures 18 and 19, that is to say, an additional one-third of a half-
revolution, the pitman would be slightly depressed, then lifted, and then, in the
last third of the half-revolution, it would be depressed to its original position. This
. would unfit it for use in a machine of this kind. By reference to Figure 13 it will
.be seen that at each of the three corners of the opening in the pitman 60 are
indentations c, and e to suit the diameter of the rollers on the crank-wrists 61
and 62, and of a depth that will be described. For convenience each wrist, and
its roller, will be called a crank. The radial centre of the indentation c is also
the radial centre of the curved face f, and the radial centre of the indentation d
is also the radial centre of the curved face g; but the face h is not radial to the
indentation e for reasons that will be given. The gear carrying the double cranks 61
and 62, turns in the direction indicated by the arrow in Figure 13.
In Figure 14 the crank 62 is shown as being in the indentation d, the crank 61
having just arrived at the point of contact with the curved face h. The continued
forward movement of the cranks will cause the crank 61 to lift the pitman which
will force the crank 62 out of its indentation, and the crank 61 into the indentation c,
as shown in Figure 15. From the position shown in Figure 15 the continued move-
ment of the crank 61 will further lift the pitman; the crank 62 operating against
the curved face ƒ shown in Figure 13, to keep the crank 61 in the indentation c
until the cranks shall arrive at the position shown in Figure 16. But for the
indentations the position shown in Figure 16 would be the maximum height to which
the pitman would be lifted, because the face h would have to be on a curve from the
axis of the wrist of the crank 62, Figure 16, to allow the crank 61 to perform the
next third of its half revolution. It will be observed by reference to Figure 16 that
the crank 62 is not at its lowest point; the indentation e should therefore be
sufficiently deep to allow it to arrive at that point without depressing the connection.
In fact the surface h, from the point of contact of the crank 61 in Figure 16 to its
point of contact in Figure 17 is somewhat straighter, or flatter, and the indentation
somewhat deeper, than is required to prevent the depression of the pitman that
would occur as this point, but for the indentation. The part of the surface that is
traversed by the crank 61, between the positions in Figures 17 and 18 should be
radial from the centre or axis of the wrist of the crank 62, Figures 17 and 18, by
reason of which the pitman will continue its upward movement to the point shown
in Figure 18, which will be its highest point. The movement of the cranks as far
as described, accounts for practically two-thirds of a half revolution, during all of
which time the upward movement has been continuous, and advantageous, inasmuch
as the work of the feed-lever is done on this upward movement of the pitman and

page_text: rear end of the feed-lever. It will be observed that except in the positions between*
that shown in Figure 16 and the one shown in Figure 17, no lost motion of conse-
quence can occur on account of wear of parts, owing to the fact that one of the
cranks will be in the indentation c or a all of the time. Attention is also called to
the fact that during the time of the movement of the cranks from the position
shown in Figure 16 to that shown in Figure 17, the feed-lever is moving the saw,
and consequently the parts will be under tension which will prevent any actual lost
motion. From the position shown in Figure 18 the forward movement of the
cranks is continued past that shown in Figure 19 to the original position shown
in Figure 13.
The movement of the crank just described, is one half of a revolution, during
which the feed-lever will have, by its bit 51, moved the saw one tooth. While
the feed-lever 50 is moving the saw forward, and the bit 51 is pressed into the
saw teeth, one of the rollers 33 or 34 should roll over and depress the rearward exten-
sion k of the retaining lever, which will permit the frame 13 and its incumbent
parts to move forward by gravity, and by the correlative action of the spring 37,
until the eccentric portion a of the pin 53 shall contact with the upward projection b
on the feed-lever as shown in Figures 11 and 12.
'
By reference to Figures 20, 21 and 24, it will be seen that the files 20 and 21 are
clamped by screws 72 and 73 in right angled grooves in the parts 74 and 75 of the
carrier 76, and that the carrier 76 reciprocable on a guide-rod 77. The guide-
rod 77 is fastened in an arm 78 that is provided with a slot and with a tongue-and-
groove connection with shaft 79 and is fastened to it by a cap-screw 81 which is
shown in Figures 20 and 21. The shaft 79 acts as a trunnion and is journalled on
the upwardly, rising bracket 80 that is attached to the frame 13, as shown in
Figures 1 and 20. On one end of the shaft 79, Figures 1 and 21, is an arm 82, that
has on one side a groove into which fits a tongue m on the shaft 79, and on the other'
side a stud o to which is attached one end of the pulling spring 85, the other end
of the spring being attached to a screw, or stud, in the lug p on the frame.
The pulling spring 85 will operate to put pressure on the file, as will be seen by
examining Figures 20 and 21 in connection with Figure 1. The slot for the
screw 81; in the arm 78 that connects it to the shaft 79, permits the lateral
adjustment of the guide-rod 77 which, as will be seen by reference to Figure 20
will cause the file to operate on the saw at a different angle; and that both files
will operate at equal angles, one side of the saw being filed by file 20, and the
other by file 21. To change from the use of one file to the use of the other; the
file that is out of use must be turned down by a partial rotation of the shaft 79. It
will be seen, by reference to Figures 1 and 20, that room is provided for the wrist 86
and the top end of the pitman 87 to pass without obstruction, and that the spring 85
should stand sufficient elongation to permit the reversal of the files, and that the
pulling tension of the spring 85 will operate to apply pressure to either file that may
be in position to operate on the saw.
It will be seen by reference to Figures 7, 8 and 20, that the retaining pawl 24 has
attached a plate 91 having bevelled edges 92 that project about equally on each side
of the plane of the saw which is shown by a broken line 90, Figure 20. It will also
be observed that both ends of the guide-rod 77 are bevelled, the bevelled faces acting,
correlatively with the bevelled edges of the plate, just described, to cause a deflection
of the guide-rod that will lift the acting file away from the saw each time that the
retaining-pawl is lifted to pass over a tooth, as has been described, the propor-
tions and positions of these several parts being such as to cause a contact that.
will produce that result.
The file-carrier 76 is reciprocated by the crank 94 through its pitman 87 that
connects it to the crank-wrist 93. As will be seen by Figure 2, the crank 94 is on
the shaft 95 that is driven by the gears 35 and 97, froin the shaft 98, which is the
hand-crank shaft, which shaft is provided with a hand-crank 99.
The feed-lever and the retaining pawl are guided against lateral displacement
by the adjusting screws 100 and 101, Figures 2, 3 and 20, that contacts with

page_text: said lever and pawl and are screwed into the frame as shown in Figures 1, 2, 3,
and 20.
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
1st. In a gin-saw filing machine, a stand consisting of a slitted fork adapted to
rest on the periphery of the space blocks and straddle the saw, the upper edges of the
metal on each side of said slit being sharpened to a scraping edge, along the portion
which comes near the saw-teeth for the purpose specified.
2nd. In a gin-saw filing machine, a stand adapted to hold the machine in opera-
tive relation to the saw, and a frame carrying the operative parts and pivoted to the
frame by means of a hinging-piece pivotally secured to said stand and to said frame
at its back end, whereby said frame has motion in its own plane and adjustability
vertically at its front end and means for holding said frame in its vertical adjustment
and at the same time permitting said movement in its own plane, for the purpose
specified.
3rd. In a gin-saw filing machine, a stand and a frame carrying the operative parts
and mounted thereon so as to have motion approximately in its own plane, a shaft
mounted in said stand, an arm thereon connecting said shaft to said frame and a
spring acting to partially rotate said shaft for the purpose specified.
4th. In a gin-saw filing machine, a stand and a frame carrying the operative parts
and mounted on said stand so as to be movable approximately in its own plane, à
shaft mounted in the stand, an arm thereon connected to said shaft and pivotally to
the frame, a stud projecting from said shaft at an angle to said arm and a spring
connected to the end of said stud for the purpose specified.
5th. In a gin-saw filing machine, a stand and a frame carrying the operative parts
and mounted so as to be movable substantially in its own plane and adjustable
vertically at one end, a shaft mounted in said stand and having arms projecting
radially in the same direction from each of its ends, a spring connected to one of the
said arms and acting to partially rotate said shaft and pitman connecting the distal
extremity of the other arm to said frame and means for making rigid the connection
between said arms and pitman for the purpose specified.
6th. In a gin-saw filing machine, a stand and a frame carrying the operative parts
and mounted so as to be movable substantially in its own plane and adjustable
vertical at one end, a shaft mounted in said stand and having arms projecting radially
in the same direction from each of its ends, a spring connected to one of said arms
and acting to partially rotate said shaft and a pitman connecting the distal extremity
of the other arm to said frame and means for making rigid the connection between
said arm and pitman consisting of a slot in said pitman and a screw passing through
said slot into said arm.
7th. In a gin-saw filing machine, a frame carrying the operative parts, a stand
adapted to hold said frame in operative relation to the saws, a feed-lever, a link sus-
pending it fulcrumally upon said frame, a tooth-engaging bit on the forward end of
said lever and projecting laterally therefrom consisting of a plate of metal thicker
along its middle, and bevelled thinner to its upper and lower edges and means for
securing same upon the forward end of said lever and of actuating said lever, for the
purpose specified.
8th. In a gin-saw filing machine, a stand, a frame mounted thereon so as to have
motion substantially in its own plane, vibratory feed-lever having a bit adapted to
engage in succession the teeth of the saw and means in operative relation to said
feed-lever for limiting the forward movement of said frame for the purpose
specified.
9th. In a gin-saw filing machine, a stand, a frame mounted thereon so as to have
motion substantially in its own plane, a vibratory feed-lever having a bit adapted to
engage in succession the teeth of the saw and means in operative relation to said

page_text: feed-lever for limiting the forward movement of said frame consisting of an upwardly
projecting lug on said feed-lever and a correlative abutment on said frame.
10th. In a gin-saw filing machine, a stand, a frame mounted thereon so as to have
motion substantially in its own plane, a vibratory feed-lever having a bit adapted to
engage in succession the teeth of the saw and means in operative relation to said feed-
lever for limiting the forward movement of said frame consisting of an upwardly
projecting lug on said feed-lever for limiting the forward movement of said frame
consisting of an upwardly projecting lug on said lever and a correlative abutment on
said frame consisting of a pin eccentrically journalled rotatably on said frame.
11th. In a gin-saw filing-machine, a frame carrying the operative parts, a stand
means for movably mounting said frame on said stand, a retaining-pawl, a bit on one
end, and the other extended backwardly, a cam adapted to lift said pawl as the saw
is fed forward and an adjustable fulcrumnal bearing for said pawl consisting of a verti-
cally slotted lug on said frame, a rotatable bushing set in said lever at its fulcrumnal
point and a screw fitting said slot and screwed into said bushing eccentrically thereof
for the purpose specified.
12th. In a gin-saw filing machine, a stand and a frame mounted thereon carrying
the operative parts, a feed-lever fulcrumed on said frame and means for causing a
vibratory movement thereof consisting of a double crank rotatably mounted on the
frame, and a pitman connected by its lower end to said lever, and in its upper end
engaging said double crank for the purpose specified, having a cam shaped opening
of the form described.
13th. In a gin-saw filing machine, a frame and means for holding same in operative
relation to the saws, a shaft mounted on said frame so as to be partially rotatable
thereon, means for elastically rotating said shaft, a guide mounted on said shaft, a
double-ended carrier mounted reciprocably on said guide and means for securing a
file to said carriers.
14th. In a gin-saw filing machine, a frame and a stand therefor adapted to hold
same in operative relation to the saws, a shaft mounted in bearings on said frame,
so as to be semi-rotatable thereon, means for elastically moving said shaft in either
rotary direction, a guide on said shaft and a double-ended file-clapping carrier recipro-
cably mounted on said guide for the purpose specified.
15th. In a gin-saw filing machine, a frame and a stand therefor adapted to hold
same in operative relation to the saws, a shaft mounted in bearings on said frame,
so as to be semi-rotatable thereon means for elastically moving said shaft in either
rotary direction, a guide on said shaft and a double-ended file-carrier reciprocably
mounted on said guide consisting of a wrist on said carrier, crank-shaft rotatably
mounted on said frame, a pitman connected to the wrists of aid crank and said
carrier and means for rotating said crank-shaft.
16th. In a gin-saw filing machine, a frame and a stand adapted to hold same in
operative relation to the saws, an upright on said frame a shaft rotatably mounted on
said upright, a guide carried on the opposite end of said shaft and a double-ended
file-clamping carrier reciprocably mounted on said guide, for the purpose specified.
17th. In a gin-saw filing machine, a frame and a stand adapted to hold same in
operative relation to the saws, a shaft rotatably mounted on the upper end of said
frame and arm projecting from the back end of said shaft, a spring secured to said
arm, means for adjusting the tension of said spring, a guide mounted upon the other
end of said shaft and a double-ended file-clamping carrier, mounted upon said guide
so as to be reciprocable thereon for the purpose specified.
18th. In a gin-saw filing machine, a frame and stand adapted to hold same in
operative relation to the saws, a shaft rotatably mounted in the upper end of said
frame, an arm to the back end of said shaft so as to be removable longitudinally
across the end of same, a spring secured to said arm at its upper end, a guide secured
to the other end of said shaft and a double-ended file-clamping carrier reciprocably
mounted on said guide for the purpose specified.
19th. In a gin-saw filing machine, a frame and a stand adapted to hold same in
operative relation to the saw, a shaft rotatably mounted in the upper end of said frame,

page_text: means for causing an elastic rotation of said shaft in either direction, and arm mounted
on the front end of the shaft so as to move longitudinally across the end thereof a rod
carried in and at substantially a right angle to the end of said arm, and a double-ended
fire-clamping carrier reciprocably mounted on said rod for the purpose specified.
20th. In a gin-saw filing machine, a frame and a stand adapted to hold said frame
in operative relation to the saw, a guide pivoted on said frame pendalously, a file-
carrier mounted so as to reciprocate on said guide, a cam surface and by conjunctive
operation therewith cause the lateral movement of said guide for the purpose
specified.
21st. In a gin-saw filing machine, a frame and a stand adapted to hold said frame in
operative relation to the saw, a guide pivoted pendulously upon said frame having its
lower end bevelled, a file-clamping carrier mounted reciprocably on said guide, a
retaining-pawl adapted to engage a tooth of the saw and vertically movable, and an
abutment carried upon said retaining-pawl and adapted when same is elevated to come
into operative relation with the bevelled end of said guide for the purpose specified.
22nd. In a gin-saw filing machine, a frame and a stand adapted to hold said frame
in operative relation to the saw, a guide pivoted pendulously upon said frame and having
its lower end bevelled, a file-clamping carrier mounted reciprocably on said guide, a
retaining-pawl adapted to engage a tooth of the saw and vertically movable, and an
abutment carried upon said retaining-pawl and adapted when same is elevated to come
into operative relation with the bevelled end of said guide and flat-headed bolts
screwed into the frame on either side of said retaining-pawl and adapted to guide
sante in its vertical movement, for the purpose specified.
Dated this 7th day of March 1899.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.