Note: Descriptions are shown in the official language in which they were submitted.
~05629~
; S P E C I F I C A T I /~ N
This invention relates to a compact electric circular
razor or saw for severing bond or vellum drawings, heavier
matboard or cardboard, photographic sheet film, sheet plastic
or plywood within a range of ~003" to .250", and can be tilted
to any predetermined angle including 45 degrees.
It is common in devices for severing in the photographic
display and picture framing businesses, to manually cut materials
with an industrial razor blade set in a slide block passing it
along a steel straightedge that lays on top of the artwork. This
10 hand method is slowly effective on lighter cuts, but on materials
over .040" needing more than one pressure cut to slit through to
the severing point, the method is inadequate. Mechanically
improved models that use razor blades but remain without a power
source, are also a problem.
I have found that present limitations can be overcome and
appllcations extended by using a small commercially available
90 degree, geared motor producins 2000 r.p.m. to drive a
circular razor 2.7" diameter for sheet matboard up to .060"
thick; cardboard, plastic or wood from .040" to .25" thick, is
; 20 severed with a slitting saw, and for paper of .003" thickness, an
attachment is provided. The power drive is mounted on a carriage
parallel to the flat of a hardened aluminum T-bar, sliding freely
;- on fluorocarbon bearings and moving with an optional 24" to 60"
length of traverse, so that either the circular razor or severance
saw, when lowered to the pivot point at the table, moves in a
straight line without twist or skewing and without clamping.
In drawings which illustrate embodiments of the invention:
Figure 1 is a ~ scale right side view of the T-bars, motor
and stops detailed in an inset.
Figure 2 is a ~ scale plan view of the table and endplate
indexes.
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Figure 3 is a ~ scale front end view of the motor slide
and guarded circular razor-cutter.
Figure 4 is a ~ scale front view of the endplate showing
the 45 degree tilt and razor-cutter change positions.
Figure 5 is a full scale plan view of the carriage detail.
Figure 6 is a full scale end view of the carriage slide
- buttons.
The machine comprises features detailed 0 to 70 in
6 figures.
i 10 Figure 1 shows two aluminum T-bars; 0 which is .002" case
hardened and 1 raw material, both optional in length from 24 to
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60 inches but always 12" longer than table 4, both tapped with
a 5/16-18 thread in the centre of the web on both ends. Table
T-bar 1 is base for a pressed wood board 4 to which is latexed
a dark grey poly-vinyl-chloride plastic top 5 and white plastic
channel edge trim 6, fastened by wood screws coming up through
the flat of the T-bar. The 0-1 T-bars are spaced apart by -
endplates 2 front and 3 rear locXing into .he end holes of 'ho
- bars using hex. head machine screws 7 and hardened heavy washers~; 20 10. Endplates 2-3 are matched pairs of ~" aluminum plate bored
~ to angle co-ordinates that set up a vertical 90, 45 or an
; optional angle. Pivoting wear is compensated for by oversize
boring of the endplates and pressing in oil impregnated bronze
bearings 13 and index bushings 14. There are two position
locking angleplates 15 mounted on table T-bar 1 front and back
using hex.screws 17, each supporting a 5/16-18 threaded stud 8,
a stud nut 16, two light washers 11 and acorn nut 9 at the pivot
; point. On the left extremity of the locking angles 15 and
fastened by three square socket screws 18, is a light ~" pin
toggle index plunger 12 that fixes the point of the angle for
the endplates 2-3 by entering into the index bushings 14.
Crossing T-bar 1 at the front only is a 24" straightedge 19 to
aliqn the product squarely before the razor. It carries a side
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' stop 22 comprising a clamp locator angle 23, a flexible clamp
bar 24 and two flathead square socket screws that ties the
three components together. Rapid setting of the qauge into
position is possible through the toggle clamp 12, and no damage
in movement occurs because of the adjustable plastic hex. screw
20 and jam nut 21. Also outlined in this view is the right
angle motor drive 29 and the razor-slitter 30. Figure 1 also
shows as an inset view, the details of the distance setting
clamps of the carriage T-bar, 25 is a 1" width of channel
aluminum to caliper the bar, with two plastic runner blocks 27
to prevent pressure damage to the bar, and a steel pressure
stud 28. The toggle pressure clamp comprising 12, 20, 21 is
carried on a anglepiate 26.
~ igure 2 relates the plan view of the Figure 1 details
adding 31 to 39 as new detail. 31 is a table filler angleplate
which bridges the gap between the table top 5 and cross
stEaightedge 19 shown held in place by square socket screws 32.
The motor is secured to the horseshoe of the carriage by a gear
clamp 33, the four guard spacer screws 34 attach the razor
cutter guard to the motor slide, and acorn nuts 35 removable for
cutter change, hold the guard front plate. Attached to the
carriage is a slide travel lever plate 36 held by two square
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socket screws 37. Identification 3~ is given in this figure to
the razor holding arbor and 39 to the plastic wear strips between
the endplates 2-3 and the locking angles 15.
Figure 3 relates to the end view of Figures 1 and 2 with
the endplates removed for clarity and the identification of
details 65 to 70 newly introduced. Two arbor spacers that
strengthen the cutter thinness shown as 65 are in turn supported
by two arbor filler flanges 66, all tightened together by a left
threaded nut exposing a ~"x9/16" long arbor that is tightened
into the motor drive chuck. The position of the inside guard
plate 67 narrowest of the two to clear the carriage at the top
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of the travel, and the outside guard plate 68 is shown. 69
i designates the toggle lever fastened on the toggle lever plate
36, Figure 2, and capped by a plastic ball 70 to compress the
, springs and give control of the motor slide depth.
`` Figure 4 adds no new components but serves to demonstrate
the possibilities of positioning from the pivot points.
Figure 5 adds full size details 50 to 61 specifying the
parts that make up the vertical motor slide. 50 is the small
set screws backing up the small fluorocarbon buttons 51 opposite
the stationary slide buttons 52. The slide front bars of the
carriage are 53, the rear 54. The motor horseshoe is a channel
aluminum piece bored to a 1 1/8" arc to fit the motor contour
and provide a centre fastening support to the motor slide 56.
The centre of the carriage is an anchor plate 57 of ~" thickness,
`- counterbored with eight 5/16"x3/32" deep pockets to receive the
stationary fluorocarbon buttons of both the slide and the traverse
, carriage. The components 53, 54 and 57 together with 40-41 of
Figure 6 are held in a fixed position by shoulder screws 58 and
jam nuts 59. Identification is also made in this Figure of the
`~ 20 two slide compression springs 60 and the motor centre, gear
- clamp rivet 61.
~ Figure 6 adds full size detail 40-49 and 62-64 specifying
'- the parts that make up the T-bar carriage. 40 is the upper bar
cut out on top to receive the lever plate 36 Figure 2, bored and
tapped to receive the large fluorocarbon buttons and set screws.
` 41 is the lower bar bored and tapped to receive the large
;- fluorocarbon buttons and set screws. 42 is the small fluorocarbon
buttons that are bearings on the ~" edges o the T-bar backed
` up by set screws 45, while 43 is the large fluorocarbon buttons
that are bearings on the flat ~f the T-bar backed up by set
screws 44 locked in the tapped holes by adhesive. Other fluoro-
carbon bearing components shown are 46 set into the pockets of
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the anchor plate 57, the larger of the slide buttons 47, backed
up by set screws 48; also the hardened rest button 49 acting as
the pusher pad for the travel lever 69. There are two ~"x~" .
angle plates 62 for fastening the chuck guard area of the motor
with square socket screws 18 to the motor slide 56 and a view
of the guard riser blocks 64 that are resting on the motor
slide 56.
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