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Патент USA US3032701

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May 1, 1962
G. CUBELLIS
3,032,691
SENSITIVE CONTACT swncn FOR MATERIAL GUIDING DEVICE
Filed March 15, 1957
2 Sheets-Sheet 1
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INVENTOR.
GUIDO CUBELLIS
ATTORNEY
May 1, 1962
3,032,691
G. CUBELLIS
SENSITIVE CONTACT SWITCH FOR MATERIAL GUIDING DEVICE
Filed March 15, 1957
2 Sheets-Sheet 2
GUIDO
FIG. 7
INVIZNTOR.
CUBELLIS
BY
ATTORN
United States Patent 0 "ice
3,032,691
Patented May 1, 1362
1
2
3,032,691
use however, it has been found that lint, threads, and
other foreign substances gathered on the lense and inter
fered with the proper operation of the switch. This has
been partially avoided by adding a source of compressed
air for blowing the switch clean. But the material is
often moist and the lint clings to the cell.
The present invention is designed to provide a highly
sensitive switch using a photo-electric cell in combination
SENSITIVE CONTACT SWITCH FOR MATERIAL
GUIDING DEVICE
Guido Cubellis, 2 Anderson Ave., West Warwick, RI.
Filed Mar. 15, 1957, Ser. No. 646,387
1 Claim. (Cl. 317-124)
My present invention relates to devices for guiding the
edge of materials and more particularly to a sensitive
switch for controlling such devices.
with a mechanical ?nger in such manner that the cell will
The arrangement of
the present invention also permits easy adjustment for
sensitivity and swing. Furthermore, many materials are
soaked in solvents giving off explosive fumes and the
’ Another object of the present invention is to provide
present invention permits the electrical portions of the
a sensitive switch which will be unelfected by lint, dust 15 device to be positioned remotely from the material and
or other foreign matter.
thus minimize the danger of explosions.
A further object of the present invention is to provide
Referring more in detail to the drawings, the device
a sensitive switch for guiding material which is adjustable
is normally mounted in a rectangular housing 10 having
for position or swing.
a front cover 11 and an open slot 12 in the bottom wall
Another object of the present invention is to provide 20 through which the sensitive ?nger extends. Referring to
, The principal object of the present invention is to pro
10 be kept virtually clean at all times.
vide a sensitive switch for contacting the edge of light
and ?imsy materials.
a sensitive switch in which the electrical portions are
FIG. 2, a rigid inverted U-shaped bar 13 is mounted cen
remotely positioned from the work to minimize the dan
trally of the rear wall of the housing by providing a pair
ger of explosion in the presence of explosive fumes.
of spaced transversed strap members 14 bolted to the
Another object of the present invention is to provide
rear Wall of the housing. The vertical leg 15 of the
a sensitive material guiding switch which is simple in con 25 member 13 is frictionally engaged by the straps 14 but
struction and easy and economical to manufacture and
permitting vertical sliding movement. The horizontal leg
assemble.
16 extends forwardly in the housing and then terminates
With the above and other objects and advantageous
in
the second vertical leg 17 which is shorter than the
features in view, my invention consists of a novel arrange
leg 15. An adjustable screw 18 extends through the top
ment of parts, more fully disclosed in the detailed descrip 30 of the housing and is locked therein by the washer 19 ex~
tion following, in conjunction with the accompanying
tending'into the upper unthreaded portion of the screw.
drawings, and more particularly de?ned in the appended
The screw 18 threadedly engages the horizontal arm 16
claim.
of the member 13. With this arrangement turning move
In the drawings,
intent of the screw 18 will cause the U-shaped member 13
FIG. 1 is a front elevation of ‘a switch embodying my 35 to slide upwardly or downwardly in the straps 14 to
invention.
'
'
provide vertical adjustment for a purpose hereinafter to be
FIG. 2 is va transverse section taken on line 2-2 on
described.
FIG. 1.
Y
Now referring to FIGS. 1, 2 and 4, I provide a plate
FIG. 3 is a bottom view of the left photo-cellmember.
20 broad in the center and narrowing to two wing like
FIG. 4 is a longitudinal section of the device in FIG. 1, 40 portions at each side. The plate 20 is provided at the
with the switch in displaced position.
top and bottom edges in the center with complementary
FIG. 5 is a vertical section through the photo-cell
arcuate portions 21 and 22. From the arcuate portions
member shown in FIG. 3.
the wings on each side taper to straight shoulders or edges
FIG. 6 is a section taken on line 6-6 on FIG. 3.
23 and 24 to the left and right, the edges 23 and 24 being
FIG. 7 is a diagram of the electrical hookup.
45 horizontal and at right angles to the vertical axis of the
When material is fed from a roll or coil to a machine,
plate as shown in FIG. 1. Extending through the plate
it is often important that the feed be accurate and straight.
26 is a bearing 25 in the form of a small rod extending
For example, cloth must be fed with straight edges into a
through the plane of the plate and having conical open
tenter frame, paper into a press, or strip metal into a
ings at each end. The location of the bearing 25 is gov
stamping press. The method of keeping the material
erned by the center of gravity of the plate 20 and it should
properly aligned is to provide a device, either mechanical,
be positioned in the exact point of the center of gravity
hydraulic or pneumatic, for shifting the material from one
so that the plate will be perfectly balanced. The mem
side to the other in response to a contact switch having
ber 13 is provided with adjustable needle-pointed screws
a sensitive ?nger at the edge of the material. In my Pat
26 and 27 extending towards each other from the vertical
ent No. 2,801,308, entitled, Contact Switch for Material 55 arms 15 and 17. The needle points 26 and 27 enter the
Guiding Device, issued July 30, 1957, I provide a novel
mechanical switch having many advantages over the con
ventional types in use. However, in many instances the
material is extremely light and ?imsy. For example,
ends of the bearing member 25 to provide a needle bear
ing support for the plate 20. With the plate perfectly
balanced and the friction reduced to a minimum the plate
26 will move at the slightest touch.
cheese-cloth, tissue paper or ?ne silk or nylon net. It 60
The contacting ?nger constitutes a thin strip of metal
will be found that these materials will tend to curl and
28 twisted at its lower end 29 so that the plane of the
bend against the pressure of the switch‘?nger making the
guide mechanism inaccurate.
To overcome the very light pressure of the ?imsy ma
terial highly sensitive switches must be used. Attempts
have been made to use photo-electric cells at the edge of
the material so that if there is a movement of the material
in one direction it will cut off light to the cell and in the
opposite direction will allow the light to hit the cell. In
strip will be at right angles to its movement. The strip
28 ends upwardly behind the plate 20 and its upper end
is bent over at 30 to grasp the upper arcuate portion 22 of
the plate. At the lower edge of the plate 20 the strip 28
is provided with a tab 31 which is mounted on the strip
‘by a screw 32, the tab extending over the bottom edge 21
of the plate. With this arrangement the screw 32 can be
loosened and the strip 28 swung arcuately to the right or
3,032,691
3
left on the plate. This provides an adjustment for posi
tion as will hereinafter be described. At a point where
the strip 28 passes the bearing member 25 an opening
must be provided for the bearing through the strip as
shown in FIG. 2.
The mechanical arrangement heretofore described com
prises the mechanical contact portion of the switch. The
electrical impulse for operating the edge guiding device
4
terial to compensate for lateral shifts in response to the
switch of the present invention.
The operation of the switch is fairly simple. The hous
ing it} is mounted above the edge of the material being
guided with the ?nger portion 29 touching the edge of
the material. It should be noted that two thick screws
56 are mounted in the upper portion of the plate 20 to
counterbalance the plate. If the screw on the left is re
moved, the one on the right will cause the ?nger 29 to
is obtained by means of a pair of photo-cell elements
mounted in the housing it), the element 33 at the left and 10 swing to the left with an extremely light pressure. If the
screw on the right is removed then the screw will cause
the element 34 at the right as shown in FIGS. 1 and 4.
a slight swing to the right. It will be found that the device
Each photo-cell member is constructed as shown in FIGS.
is extremely sensitive to very light pressures. Since the
3 to 6 inclusive. Each member comprises a rectangular
plate does not actually contact a switch it is free to swing
block or base 35 made of Bakelite or similar dielectric ma
terial having a slot 36 extending inwardly from one long 15 at the slightest touch. The adjustable screw 18 is set so that
the flat portions of the plate 23 and 24 are positioned just
edge approximately two thirds of the way through the
below the slots 45 in the photo-cell member 44. If the
block. As shown in FIGS. 5 and 6 a recess opening 37 ex
material should swing to the right as shown in FIG. 4 the
tends into one edge of the block and terminates in a small
right wing of the plate 20 will shield the slot 45 and de
er opening 38 communicating with the slot 36. V Opposite
the opening 38 a small opening 39 extends through in 20 energize the photo-cell and one of the relays 52 or 53 to
throw the right hand switch and cause the material to be
alignment therewith. A small pencil ?ash light blub 40‘,
shifted
back to the left. The ?nger 29 will follow the
preferably of low voltage is mounted in the opening 37
material until both slots 45 are unshielded. The same
against the action of a spring 41 and held in place by a
operation takes place if the swing is in the opposite direc
cotter pin 42 which extends through the block as shown
tion. The portions 23 and 24 of the plate control the
in FIG. 6. The pin 42 also servs as one of the electrical
amount of permissable swing before the photo-cell is de
connections to the bulb. The spring 41 permits easy
energized. If they are drawn up close to the slots 45
removal of the bulb after the pin has beenldrawn out.
very little swing is permitted. If they are dropped away
The bulb 4t} is designed to throw a beam of light through
from the slots 45 more swing is permitted. Where the
the opening 38 across the slot 36 into the opening 39.
Mounted in the opening 39 is a photo-electric cell 43 de 30 device is operated with the photo-cells initially shielded,
then the swing of the plate will unshield one cell and
‘signed to operate in response to the light from the bulb
energize the relay. The operation is the same whichever
40. An inverted U-shaped plate 44 is mounted over the
method is used.
opening 39 with the sides of the U-shaped portion stradi
The construction of the machine sometimes does not
dling the block 35. The plate 44 is provided with a thin
permit
the housing it) to be positioned exactly over the
slot 45 as shown in FIG. 4 through which the light from
edge of the material. In such cases the screw 32 on the
the bulb 40 must travel to energize the cell 43. To keep
strip 28 is loosened and the strip rotated along the edges.
the face of the photo-cell 43 clean and free from dirt
21 and 22 at an angle to the vertical axis of the plate.
the plate 44 is slightly raised from the surface of the
This will permit the strip to be positioned at an angle
block as shown in FIG. 5 and a translucent strip of ma
terial 46 is slipped under the plate. The strip 46 may be 40 touching the edge of the material, such as the position
shown in FIG. 4, while the plate is in horizontal position
glass or plastic or any other similar material. The strip
such as shown in FIG. 1. It should also be noted that
46 serves to seal the opening 39 against dust and dirt
the light bulb 44) in each cell unit is so close to the photo
but permits light from the bulb 4t} entering the slot 45
cell 43 that sufficient current variations are set up to op
to pass through it to the cell 43. The strip 46 may be
erate the relays 52 and 53 and switches 54 and 55 Without
pulled out at any time for cleaning.
45 the need of an ampli?er circuit. This makes the device
The photo-cell members 33 and 34 are mounted as
simpler and ,more economical to install. It should also»
shown in FIGS. 1 and 4 so that pivotal movement of the
be noted that the device can be adapted for a shielded
plate 20 will swing the wing sections to the plate through
operation where the wing portions 23 and 24- of the plate
the slots 36. In initially adjusting the plate 20 it must
?rst be determined whether it is to be with shielded or 50 normally cover the slots 45 and will uncover them when
they swing into the position shown in FIG. 4.
unshielded light. If the operation is to be with unshielded
With the electrical circuit shown the device is balanced
lights then the set screw 18 is adjusted to pull the plate
and will become inoperative if. either of the lights or cells
2t) upwardly or downwardly until the ?at horizontal edges
23 and 24 at the wing ends are just below the slots 45 in
the plates 44. The closer they are to the slots, the ?ner
the adjustment; the further they are from the slots the
more play in the ?nger 2.9 before the adjustment is made.
should fail. Other advantages of the present invention
will be readily apparent to a person skilled in the art.
I claim:
‘
A control device for operating a material guiding mech
anism
comprising a pair of switches for energizing said
Before describing the operation of the switch it'must
material guiding mechanism, a vertically mounted housing,
be properly hooked up as shown in FIG. 7. It should be
a pair of photo-electric cell and light units in said housing
noted that the light 4% and photo-cell 43 are the only 60 for energizing said switches, a flat elongated tongue piv
parts shown in the diagram which are actually located in
otally depending from said housing for engaging the edge
the housing llti. It is contemplated that the other opera
of the material to be guided, and a plate mounted on. said
tive electrical parts be positioned in a separate housing
tongue for shielding and unshielding said lights in re
remote from the. work and connected to the housing 10
by the’ necessary wiring. This will minimize the danger 65 sponse to pivotal movement of said tongue, each of said
units comprising a rectangular dielectric block, said block
of explosion from explosive fumes. A source of 1150 V.
havinga transverse slot extending inwardly from one
AC. current 47 is connected to a DC. recti?er 48. The
side edge, said block having longitudinal openings in
bulbs 4® are connected in series, a resistance 49 cutting
' alignment communicating with said slot, a photo-electric
. the voltage to the proper value. The DC. current is
shunted by a resistance 5% and condenser 51 and supplies 70 cell mounted in one opening, a light bulb mounted in
the opposite opening facing said cell, and a shield cover
the photo-cells 43. The photo-cells 43 are connected to
a pair of relays 52 and 53, the relay 52 operating the ‘ ring said light bulb opening, said shield having a narrow
switch 54 the relay 53 operating the switch 55.’ The ' slot.
switches 54 and 55 are connected by suitable wiring to
(References on foliowing page)‘
.
the mechanism (not shown) 'used for moving the ma 75.
8,032,691
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,219,345
1,930,496
Newell _____________ __ Mar. 13, 1917
Wilson ______________ __ Oct. 17, 1933
2,075,111
2,199,071
2,237,811
2,243,456
2,715,707
2,801,308
6
Gulliksen ____________ __ Mar. 30,
Gale ________________ __ Apr. 30,
Cockrell _____________ __ Apr. 8,
Dutter ______________ __ May 27,
Haskins _____________ __ Aug. 16,
Cubellis _____________ .._ July 30,
1937
1940
1941
1941
1955
1957
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