Note: Descriptions are shown in the official language in which they were submitted.
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This invention relates generally to multiple sawing devices for
use in the manufacturing of cant strips for the industrial roofing trade and
the like.
A common problem with known prior art devices of this type are
that the devices are relatively complicated to adjust, and fail to maintain
a set adjustment after the initial adjustment thereof.
Another common problem is that a number of the known devices using
multiple saw blades have saw blades of different diameters to accomplish the
end result. A great disadvantage of this type device is in the different
rates of wear for the different diameter saw blades.
Known prior art U.S. patents which may be pertinent to this
invention are as follows:
H.A. Current 136,216 Feb. 25, 1873
G. Morgan et al 149,327 April 7, 1874
J.T. Hall321,716 July 7, 1885
S.D. Riegal386,035 July 10, 1888
W.F. Barnes683,015 Sept. 24, 1901
M.P. Burrows 1,818,300 August 11, 1931
L.A. Holan3,625,269 Dec. 7, 1971
None of these known prior art devices offer the new and unique
features of the invention disclosed herein.
An object of the present invention is to provide a multiple
sawing machine for producing cant strips for the industrial roofing trade.
Two banks of multiple saw blades set at approximately 45 degree angles to
the main support surface are utilized to effect this object.
Another object of the present invention is to provide a cant
strip machine which will greatly increase the amount of daily production of
cant strips as compared to the number produced by conventional type sawing
machines.
The present invention relates to a cant strip sawing machine
comprising means for simultaneously sawing multiple cant strips for use in
the industrial roofing trade including a support frame, means on the support
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frame for adjustably mounting two banks of saw blade assemblies, means
provided for positively feeding material to be cut lengthwise into the
banks of saw blade assemblies for the purpose of producing high speed
cutting of a large number of cant strips simultaneously, the means for
adjustably mounting the two banks of saw blade assemblies including a
plurality of transverse bars across the width of the support frame, with
each bank of saw blade assemblies having individual adjustments for each
respective blade assembly associated with the transverse bars.
In accordance with one aspect of the invention, the machine
further includes intermediate drive shafts appropriately supported on
the support frame together with adjustable means between each individual
saw blade assembly and the closest associated intermediate drive shaft
for permitting accurate adjustments of the width of cant strips to be
cut as well as tension adjustments for the drive means for the saw
blade assemblies.
In accordance with another aspect of the present invention,
the machine is provided with means for positively feeding material to be
cut including at least a single feed roller mounted transversely of the
support frame.
These and other features of the invention will become more
apparent from the following description in which reference is made to
the attached drawings:
Figure 1 is a top plan view of the cant strip sawing machine
of this invention.
Figure 2 is a left side view of the machine of this invention.
Figure 3 is a front end view, partly in cross section, of the
machine of this invention.
Figure 4 is a cross-sectional view of one of the saw blade
29 arbor assembl~es for use with the machine of this invention.
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Referring to Figure 3 of the drawings, reference numeral 10
indicates the over-all cant strip sawing machine of this invention. The
main frame for the machine consists of hollow steel tubing sections 12
and 13 normally from cold rolled stock and of approximately 3 inches by
12 inches in cross section and of appropriate size to make an over-all
frame of 4 feet 4 inches by 6 feet 10 inches outside dimensions. Where
the pieces abut at the corners appropriaté welding, not shown, is used
to securely fasten the steel tubing together. Beneath the four corners
of the main frame structure are welded support legs 14. These support
legs 14 consist of two flat, half inch stock, triangular shaped pieces
welded at the corners where they abut with two pieces being provided and
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appropriately welded at each corner of the main frame structure a8 best seen ln
Figures 1 and 2. An optional bottom plate 16 for said legs may al~o be provided.
Now viewing Figure 2, the supports for the saw blade assemblies will
be described. Two sets of twin cro~sbars 118 cut from four inch by four inch
steel tublng are set approximately two lnches apart to accommcdate the bases
for the saw arbors. These steel tubes 118 are appropriately welded to the side
frame members 12 underneath thereof. Dovetail ways 120 are centered on the top
of each of said cro6sbars and serve a~ guides for the adjustable saw blade
assemblies.
Intermediate trive shafts 21 and 23 are supported frcm appropriate
bearing mounts 24. The intermediate drive shaft 21 i9 supported approximately
the middle of the frame and the intermediate trive shaft 23 is supportet at3a-
cent the front of the support table. One end of each of said intermediate
trive shafts has a touble pulley 110 thereon for transfer of power from a
tor-driven pulley 112 by means of V-cog belts, as best 6een in Figures 1 and
3. Two motors 20,22 Of approximately 15 horsepower apiece are appropriately
supported on a supporting crossbar 28 and motor support mounts 30.0bviously
appropriate mounting adjustment means are provitet for each of said tor mounts
to permit proper alignment of the trive pulleys 112 with the belts ant upper
driven pulleys 110. The V-type cog belts are inticated by reference numeral
113. Appropriate belt cover guards 111 are also provided on each side of the
machines to protect the operator and other workers from any contact with the
revolving pulleys and belts. This is an important safety feature to meet with
OSHA standards.
As viewed in Figure 1 the intermediate drive shafts 21 and 23 must
be completely removed from the machine in order to replace the drive belts for
the saw arbor assemblies. However, to reduce the replacement time for worn
belts an adequate supply of same may be stored at one end of the intermediate
drive shafts for use whenever necessary. This invention also provides for a
shortening of said intermediate shafts 21 and 23 so that the bearing 24' on the
end of said shaft opposite to the drive pulley 110 may be easily removed by
simply removing bolts 25. With the shortened drive shaft 21 terminatin8 just
inside of the frame member 12, this end of the drive shaft is rai~ed for replace-
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ment of pulley~ 119 and the corresponding saw blade drive belts. The corre-
sponding opposite end of intermediate drive shaft 23 may also be 80 shortened
with the bearing block for said end also being readily removable, not shown.
The ~aw arbors, their special shape and special function are very
important features of ~his machine. The base of the arbors are each individual
bases, preferably made from one-half inch thick steel approximately three inche~
by twelve inches. Centered on the underside of the base, a two inch wide by
one-half inch thick steel bar is connected to the base by two 5/16" countersunk
screws. This bar extends downward approximately 4-1/4 inche~ through the two
inch space between the crossbars 118 and i8 drilled and tapped for an Allen
screw (3/8 inch). Another one-half inch thick by four inch steel bar drilled
through the center bridges the underside of the crossbars 118. The 3/8 inch
Allen screw clamps the one-half inch by four inch steel bar and the connecting
bar from the base tightly to the two crossbars 118. Both the clamp and the
arbor base are fitted with sliding ~ays to keep them at a perfect 90 degree
angle to the crossbars.
The arbor saw assembly support structure, best seen in Figure 4,
consists of the following. A solid steel saw assembly bracket 201 is appropri-
ately machined in the shape as shown. Appropriate apertures are bored in the
20 upper end of the member 201 for reception of ball bearings 205 and 206. These
bearings preferably are press-fitted into the bracket 201. The saw arbor 202
is then inserted within the bearings, said arbor 202 having an enlarged headed
portion 209 and a central shaft portion 207. One end of said saw arbor shaft
is appropriately machined for reception of a saw blade up to twelve inches in
diameter and appropriate locking means such as a locknut shown in broken lines
may be used. The other end of arbor 202 has a locking ring 212 and a saw arbor
pulley 203 mounted thereon, and locking or fastening screw 204 for said pulley
for appropriately fastening the pulley to the shaft for driving purposes.
The other end of the saw arbor support member 201 has appropriate
apertures provided therein for reception of short and long socket head type cap
screws 211 for the purpose of attaching the saw bracket to adjusting slide 220.
Looking at Figure 2, the adjusting slide 220 can be seen mounted upon the arbor
base plate 222 which has complementary dovetail slots therein for sl~dable
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mo~ement along the dovetail members 120. The arbor base 222 is ad3ustably
secured to the transverse bars 118 by means 224 and 226. The support means
224 has appropriate clamping plates 225 which engage either side of the bars
118 for clamping thereto by means of the locking 3crew 226. Thus it can be
readily visualized that each individual saw arbor mounted upon the above
described structure can be slid sideway~ or transversely of the over-all
machine on the transverse bars 118. Once the desired setting between the
individual saw arbor supports is achieved the locking screws 226 for each
individual arbor assembly are secured to fasten the saw arbors in place. The
base support plate 220 msy be ad3usted longitudinally of the machine by means
of the locking screw and nut thereon 221 for the purpose of increasing or
decreaslng the individual saw drive belt tensions. The front bank of saw blades
are labelled 300 while the secondary or rear bank of saw blades are labelled
200'. Drive belts 302 and 302' are appropriately connected between the driv-
ing pulleys 119 and 119' mounted on the intermediate drive shafts 23 and 21.
As can best be seen in Figure 3, all the saw blades 300 are angled to the left
as viewed from the front of the machine while all of the fiecondary saw blades
300' are angled to the right as viewed from the same position. Thus the banks
of saw blades are basically perpendicular to each other and are in a respec-
tive plane of approximately 45 degrees from the table horizontal plane.
Saw blades up to 12 inches in diameter may be used with this machiue.Once the blades are installed on the arbor a~semblies and the drive belts
properly ad3usted for tension and the horizontal spacing between the respec-
tive saw blade assemblies ad3usted for the desired width of cut, the machine
will cut or saw for many hours without any maintenance. Appropriate apertures
have been provided in the table surface for passage of the 8aw blades. Filler
plates, not shown, are then installed between the saw blades and the balance
of the openings in the table. The tabletop or saw bed is also unted by
ad3usting means which will permit a slight ad3ustment of said table up to an
inch or so. Conventional type fences are provided on both the right and left
sides of the table bed, to permit adjustment for different widths of material
to be cut. The left side normally is the one which iB ad3us~able. Adjustable
side tension roller 3tructure 225' is normally provided within the left fence
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to hold the material be$ng cut against the right side fence.
A self-feeting mechanism i8 provided for this machine. Thi8 con-
sists of the corrugatet feed rollers 407 and 407' approximately unted on the
upper portion of the machine by tension bearing mounts 401. The feed rollers
407 and 407' are preferably corrugated steel rollers for gripping and feeding
th~ material being sawed. The front drive feed roller 407 is provided there-
beneath with a lower idler roller 403, best seen in Figure 3. Ball bearing
support assemblies 408 are appropriately provided for the shats of each of
said rollers. A sprocket 402 is provided at one end of the feed roller shaft
and appropriately connected by a chain drive 426. The chain drive is appro-
priately driven from a small electrical tor 415, preferably of approximately
1-1/2 horsepower which has reduction transmission 414 to reduce the output speed
for the purpose of driving the chain and gearings for the feed rollers.
A safety cover, not sho~n, is appropriately provided for covering the
entire top of the machine once all the ad~ustments have been made and the
~achine is ready to be put into operation. Appropriate saiety switches of the
magnetic on-off type together with a reversible feed switch for the feet rollers
are all unted in a switch panel 60 shown in Figure 1. Appropriate over-load
fusing may also be provided within this panel.
Another feature envisioned by this invention is sawdust collection
means provided ad~acent the saw blade assemblies either on top of the table bed
or underneath thereof.
