U.S. patent number 3,857,409 [Application Number 05/345,004] was granted by the patent office on 1974-12-31 for liquid mixing apparatus.
Invention is credited to William B. Aubrey, Angelo A. Giordano, Raymond Giordano.
United States Patent |
3,857,409 |
Aubrey , et al. |
December 31, 1974 |
LIQUID MIXING APPARATUS
Abstract
An aspirating mixing apparatus wherein a first and second
component of a given composition is mixed with water in desired
proportions and deposited within a first reservoir tank, a third,
fourth and fifth component of a particular composition is mixed
with water and is deposited in a second reservoir tank, a mixing
block is used in each mixing system wherein a plurality of
particularly sized orifices are employed and arranged in such a way
so as to closely approximate the desired proportions, restricted
type of flow control valves are located within the conduits of each
of the components so as to adjust the volume flow of the particular
component to its mixing block, the mixed liquid of the first mixing
block is conducted into the first reservoir, the mixed liquids of
the second mixing block are conducted into the second reservoir
tank, each of the reservoir tanks include a float, each of the
floats being connected to separate solenoid valves, each solenoid
valve to control supply of water to its respective said mixing
block.
Inventors: |
Aubrey; William B. (Northridge,
CA), Giordano; Angelo A. (Canoga Park, CA), Giordano;
Raymond (Canoga Park, CA) |
Family
ID: |
23353064 |
Appl.
No.: |
05/345,004 |
Filed: |
March 26, 1973 |
Current U.S.
Class: |
137/412; 137/893;
137/889 |
Current CPC
Class: |
B01F
3/088 (20130101); B01F 5/0413 (20130101); Y10T
137/87595 (20150401); Y10T 137/87627 (20150401); B01F
2215/0093 (20130101); B01F 2003/0896 (20130101); Y10T
137/7368 (20150401) |
Current International
Class: |
B01F
5/04 (20060101); B01F 3/08 (20060101); F16k
019/00 () |
Field of
Search: |
;137/604 ;95/89R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Nilson; Robert G.
Attorney, Agent or Firm: Geauque; Robert E.
Claims
What is claimed is:
1. A liquid mixing apparatus comprising:
a housing;
a first mixing section and a second mixing section, each of said
mixing sections being mounted upon said housing;
said first mixing section having a first inlet and a second inlet
and a water inlet, said first mixing section having first means to
intermix the liquid of said first inlet with a portion of said
water and conduct such into a first conduit, said first mixing
section having second means to intermix the liquid of said second
inlet with a portion of said water and conduct such into a second
conduit, both said first conduit and said second conduit extend
exteriorly of said first mixing section and deposit both the
respective liquids into a first reservoir tank;
said second mixing section having a third inlet and a fourth inlet
and a fifth inlet and a water inlet, said second mixing section
having third means to intermix said water and the liquids of said
third, fourth and fifth inlets and conduct such into a third
conduit, said third conduit extends exteriorly of said second
mixing section and deposits its liquid into a second reservoir
tank; and
means for separately removing the liquids from said first and said
second reservoir tanks.
2. Apparatus as defined in claim 1 wherein:
both said first mixing section and said second mixing section
comprising a solid block of material having a plurality of conduits
formed therein, within said block of said first mixing section said
water inlet being divided into a pair of spaced apart water
conduits, one of said water conduits being located adjacent said
first inlet and the other of said water conduits being located
adjacent said second inlet, the angular spacing between said first
inlet and its respective said water conduit being an acute angle,
the angular spacing between said second inlet and its respective
said water conduit being an acute angle.
3. Apparatus as defined in claim 2 wherein:
each of said acute angles comprising substantially 45.degree..
4. Apparatus as defined in claim 2 wherein:
each of said water conduits including a venturi, said first inlet
intersecting its respective said water conduit just downstream of
its respective said venturi, said second inlet intersecting said
water conduit just downstream of its respective said venturi,
conduits of said third inlet and said fourth inlet and said fifth
inlet intersect the water conduit of said second mixing section
just downstream of its respective said venturi.
5. Apparatus as defined in claim 4 wherein:
said third inlet being located substantially at a 45.degree. angle
with respect to said water inlet, said fourth and fifth inlets
being located substantially at a 90.degree. angle with respect to
said water inlet.
6. Apparatus as defined in claim 1 wherein:
restrictor valve means to control the flow of liquid into said
first, said second, said third, said fourth and said fifth inlets,
said restrictor valve means capable of being individually operated
for each said inlet so as to individually control the volume of
liquid being conducted to said inlet.
7. Apparatus as defined in claim 1 wherein:
a first float located within said first reservoir tank, a second
float located within said second reservoir tank, said first float
being operatively connected to a first solenoid valve, said second
float being operatively connected to a second solenoid valve, upon
the level of liquid within either of said reservoir tanks falling
below a certain level the movement of said float by gravity causes
activation of its respective said solenoid valve, upon said first
solenoid valve being activated water is permitted to be conducted
into said first mixing section, upon said second solenoid valve
being activated water is permitted to be conducted into said second
mixing section.
8. A liquid mixing apparatus comprising:
a first mixing section and a second mixing section, said first
mixing section having a first inlet and a second inlet and a water
inlet, said first mixing section having first means to intermix the
liquid of said first inlet with a portion of said water and conduct
such into a first conduit, said first mixing section having second
means to intermix the liquid of said second inlet with a portion of
said water and conduct such into a second conduit;
said second mixing section having at least a third inlet and a
water inlet, said second mixing section having a third means to
intermix said water and the liquid of said third inlet and conduct
such into a third conduit; and
both said first mixing section and said second mixing section each
comprise a solid block of material having a plurality of conduits
formed therein, within said block of said first mixing section said
water inlet being divided into a pair of spaced apart water
conduits, one of said water conduits being located adjacent said
first inlet and the other of said water conduits being located
adjacent said second inlet, the angular spacing between said first
inlet and its respective said water conduit being an acute angle,
the angular spacing between said second inlet and its respective
said water conduit being an acute angle.
9. Apparatus as defined in claim 8 wherein:
each of said acute angles comprising substantially 45.degree..
10. Apparatus as defined in claim 8 wherein:
each of said water conduits including a venturi, said first inlet
intersecting its respective said water conduit just donwstream of
its respective said venturi, said second inlet intersecting said
water conduit just downstream of its respective said venturi.
11. Apparatus as defined in claim 10 wherein:
restrictor valve means to control the flow of liquid into said
first, said second and said third inlets, said restrictor valve
means capable of being individually operated for each said inlet so
as to individually control a volume of liquid being conducted to a
said inlet.
Description
BACKGROUND OF THE INVENTION
All hospitals and most doctors' offices have X-ray equipment.
X-rays must be developed and it is common for each hospital and
doctor's office to have an automatic X-ray processor. An X-ray
processor is a device which is basically composed of a chemical
developer bath and a chemical fixer bath. The undeveloped X-ray
film is placed automatically within the developer bath for a
certain period of time until the X-ray image is developed. At that
time, the X-ray film is moved to the fixer bath where the image is
cleared and fixed. The film is then advanced through a wash tank to
remove chemical residue and lastly through a dryer section where
the film is dried, completing the processing cycle.
The three major components which make up the developer are Part A
(hydroquinone and a mild alkali), Part B (acetic acid) and Part C
(aldehydes). A common percentage composition by volume of working
developer solution is 25 percent of Part A, 5 percent of Part B, 5
percent of Part C and 65 percent water. Component make-up, number
of parts, and relative volumes of each may vary slightly according
to brand of chemistry used.
An example make-up of the fixer is an ammonium thiosulfate (Part A)
composition and a tannic acid composition (Part B). The desired
volumetric breakdown of the fixer composition is about 25 percent
Part A, about 10 percent Part B, and 65 percent water. This fixer
also may change slightly in composition and relative volume
according to brand of chemistry used. The mixing apparatus has
structure to make it compatible with all major chemistry
suppliers.
As an X-ray film is developed, a portion of the chemicals are used
requiring that additional chemicals be resupplied to maintain
chemical strength before the insertion of another film. The same is
true for the fixer solution. In actual practice for a normal size
of X-ray film (14 by 17 inches), it has been found that as each
film is developed, the fixer must be replenished with approximately
110 cubic centimeters of new fixer solution, with the developer
bath to be replenished with approximately 65 cubic centimeters of
new developing solution. Volumes may vary slightly as per chemical
brand requirements and number of films processed per unit of time,
type of processor used and type of film being developed.
Previous to this invention it has been known to manually mix a
quantity of replenishing fixer solution and developer solution in
separate large drums. A pump is connected to the developer bath and
a pump is connected to the fixer bath in the normal X-ray
processor. When a film is placed within the processor, a switching
mechanism is activated which pumps the required amount of fluid
into the particular bath from its storage tank. In this way the
baths are automatically replenished. However, there are certain
disadvantages such as it is required to periodically make up the
storage solution. Besides the inconvenience of having to make up
the solution, the solution tends to neutralize itself in time. The
life expectancy is approximated at 2 weeks for the mixed solutions.
Further, because a substantial quantity of each solution is used in
most instances, a substantial quantity must be made up in each
storage drum. Substantial amount of space is required to store such
large size drums which contain about two-thirds water by
composition.
SUMMARY OF THE INVENTION
It is the primary objective of this invention to eliminate the
aforementioned problems by eliminating the use of large storage
drums and eliminating the need for manually premixing the developer
solution and the fixer solution. The apparatus of this invention is
composed of a housing which is divided into a first reservoir tank
and a second reservoir tank. A discharge line extends from the
first reservoir tank to the developer bath pump of the X-ray
processor with a discharge line extending from the second reservoir
tank to the fixer bath pump. A float is mounted within each of
these reservoir tanks and is operatively connected through a rod to
respective solenoid valves. Each solenoid valve has water supplied
to it from a conventional water source. Upon activation of one of
the valves, water is conducted to a first mixing section and upon
activation of the other of the valves, water is to be conducted to
a second mixing section.
The first mixing section comprises a block, of plexiglass or the
like, which has formed therein a plurality of orifices and
conduits. The second mixing section is similarly constructed. The
first mixing section divides the water into two separate channels.
Also formed within the block is an inlet for ammonium thiosulfate
(Part A fixer concentrate) and also an inlet for tannic acid (Part
B fixer concentrate). The water is applied under a pressure of
approximately 25 pounds per square inch to the water inlet into
each of the channels. Within each of the channels is located a
venturi. The inlet for the Part A fixer intersects one of the water
channels just downstream of its venturi. The inlet for the part B
fixer intersects the other of the water channels just downstream of
its venturi. The intersection angle of each is to be an acute angle
at approximately 45.degree.. It is found that when the angle is
acute, a greater amount of the concentrate portion is intermixed
with the water within its respective water channel. The combined
Part A fixer and water is then conducted exteriorly of the mixing
section and into the fixer reservoir tank. The same is true for the
Part B fixer and its mixed water. A similar mixing arrangement is
achieved through the second mixing block with the developer
components being deposited into the developer reservoir tank.
The supply conduits for each of the developer components and the
fixer components include a flow control valve which permits precise
adjustment of the volume of flow of each of these components into
its respective mixer section. In this way, precise amount of each
component within the final mixer can be closely controlled as per
manufacture recommendations.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view of the apparatus of this invention;
FIG. 2 is a side view of the apparatus of this invention taken
along line 2--2 of FIG. 1;
FIG. 3 is a top view of the apparatus of this invention taken along
line 3--3 of FIG. 2;
FIG. 4 is a side view of the apparatus of this invention taken
along line 4--4 of FIG. 3;
FIG. 5 is an exploded isometric view of the developer mixing
section showing in more detail the internal orifice arrangement;
and
FIG. 6 is a view similar to FIG. 5 but of the fixer mixing
section.
DETAILED DESCRIPTION OF THE SHOWN EMBODIMENT
Referring particularly to the drawings, there is shown the mixing
apparatus 10 of this invention which is basically composed of a
housing 12, a first mixing section 14 and a second mixing section
16. The housing 12 is to be constructed of a plurality of vertical
walls 18 interposed between a top plate 20 and a bottom plate 22.
The vertical walls 18 cooperate between the top 20 and the bottom
22 to form a pair of spaced apart enclosed chambers 24 and 26. The
chambers 24 and 26 are to be fluid-tight and capable of retaining a
supply of a liquid. The material of construction of the walls 18,
plate 20 and bottom 22 are shown to be of a substantially
transparent plexiglass material. However, the material of
construction could be readily varied, if desired.
Formed within one of the walls 18 and adjacent the bottom 22 and
communicating with the chamber 24 is an opening 28. In a similar
manner, an opening 30 communicates with the chamber 26. Screw
threadingly attached within the opening 28 is a connector 32 and in
a similar manner a connector 34 cooperates within the opening 30. A
conduit 36 is attached to connector 32 with a conduit 38 being
attached to connector 34. The free end (not shown) of the conduit
38 is to extend within the fixer bath of an X-ray processor. The
conduit 36 is to extend within the developer bath of the X-ray
processor (not shown).
Extending within the chamber 24 is a float 40 and in a similar
manner extending within the chamber 26 is a float 42. The floats 40
and 42 are of conventional construction and adapted to float within
a liquid having a density similar to water.
Float 40 is screw threadingly attached to a rod 44 with the float
42 being threadingly attached to a rod 46. Rod 44 extends through
the top plate 20 and is connected to an actuating arm 48. In a
similar manner the rod 46 extends through the top 20 and is
connected through a nut to an actuating arm 50. A protective shield
52 surrounds the arm 48 and is fixedly secured to a switch housing
54. In a similar manner a protective shield 56 surrounds the
actuating arm 50 and is permanently affixed to a switch housing 58.
Within each of the switch housings 54 and 58 is located a
conventional electrical switch which is activated upon the float 40
or float 42 being moved downwardly a predetermined distance
determined by the level of liquid within its respective chamber 24
or 26. Electrical power is supplied to the switches through an
electrical conduit 60 and through a connecting conduit 62 which
interconnects switches located within the housings 54 and 58. It is
to be understood that the housings 54 and 58 are fixedly mounted
upon the top plate 20.
Upon activation of the switch located within the housing 54, a
solenoid valve is activated which is located within the solenoid
valve housing 64. In a similar manner, if the switch located within
housing 58 is activated, a solenoid valve is also activated which
is located within the housing 66. Water is to be supplied under
pressure through inlet conduit 68 through a T connector 70 to water
conduits 72 and 74. The water is supplied in a constant pressure of
approximately 25 p.s.i. into conduit 68. However, this pressure
could be varied if desired. It is to be understood that there would
be a water pressure regulator upstream of conduit 68 adjacent the
source, not shown. A typical source could be the water lines within
a building.
Conduit 72 connects with the housing 66. Conduit 74 connects with
the housing 64. With the valve located within the housing 66 being
closed, water is not permitted to pass from conduit 72 through the
solenoid valve housing 66 and into conduit 76. In a similar manner,
if the solenoid valve within the housing 64 is closed, water is not
capable of being conducted from conduit 74 through the housing 64
and into the conduit 78. If the valve located within housing 66 is
open, water does pass into conduit 76 through elbow 80 into conduit
82 and into opening 84 formed within the solid block of material 92
which makes up the first mixing section 14. In a similar manner, if
the valve located within valve housing 64 is open, water is
permitted to pass from conduit 74 into conduit 78 and through elbow
86 into conduit 88 and into opening 90 of the solid block of
material 94 which makes up the second mixing section 16.
Within the block 92 the opening 84 connects with a cross opening
96. Normally it is envisioned that the size of the opening 96 will
be approximately one-fourth inch in diameter. In each end of the
opening 96, a pair of orifices 98 and 100 connect therewith in a
transverse manner. The size of orifice 98 is to be envisioned to be
1/32 of an inch in diameter with the size of orifice 100 to be 1/16
of an inch in diameter. The reason for the differences in sizes
will become more apparent further on in the description. Orifice 98
connects with a larger sized orifice 102 which is envisioned to be
sized 1/16 of an inch in diameter. Orifice 100 connects with
enlarged orifice 104 which is envisioned to be approximately 1/8 of
an inch in diameter. Because the water is being forced from an
enlarged opening 96 into smaller diametered openings 98 and 100,
the velocity of the water increases. Once the water reaches
orifices 102 and 104, a decrease in velocity occurs and also a drop
in pressure. This drop in pressure tends to create a vacuum at the
junction of orifice 98 with orifice 102 and at the junction of
orifice 100 with orifice 104. As a result a venturi action is
created. At the junction of orifices 98 and 102, a third orifice
106 communicates therewith at a 45.degree. angle. The size of
orifice 106 will be approximately 1/16 of an inch for reasons which
will be described further on in the specification. At the junction
of orifices 100 and 104, a third orifice 108 connects therewith at
also a 45.degree. angle. The size of the third orifice is 1/8 of an
inch. Orifice 106 connects with conduit 110 with orifice 108
connecting with conduit 112. Conduit 112 connects with opening 114
in the solid plexiglass block 116.
Conduit 110 connects with opening 118 in block 116. Located upon
the outer surface of the block 116 is indicia beside each opening
114 and 116 representing a series of numbers from zero to fifteen
in each instance. To be located within each opening 114 and 116 is
a solid element (normally metal) 120 which tends to be displaced
vertically within its respective tapered opening dependent upon the
flow of liquid through the opening. As the flow of liquid
increases, the greater the vertical displacement of the element
120. The particular numeral of the indicia located which is
directly adjacent the element 120 gives an indication of the
volumetric flow being conducted into its respective conduit 110 or
112. The amount of flow can be controlled within each opening 114
or 118 by manual adjustment of a restrictor type of valve 122. It
is to be understood that there will be a valve 122 for each opening
114 and 118. Fluid will be supplied to the valve 122 through supply
conduits 124 and 126. Conduit 124 will supply fluid into opening
114 with conduit 126 supplying fluid into opening 118. It is
envisioned that conduit 112 will supply Part A fixer, an ammonium
thiosulfate composition, with conduit 110 supplying a tannic acid
composition, Part B fixer.
Referring in particular to the first mixer section 14 shown in FIG.
6 of the drawing, the Part A fixer is conducted from conduit 112
into orifice 108. Due to the venturi action at the connection
between orifices 100 and 104, Part A fixer is drawn and intermixed
with the water passing through orifices 100 and 104. Because of the
particular selecting of orifice size, the approximate desired
quantity of Part A fixer solution is intermixed with the water. It
has been found that with the orifice size shown, the quantity of
Part A fixer which is conducted within orifice 104 would be
approximately one-third of the total volume of liquid within
orifice 104. This resultant mixture is conducted through discharge
conduit 128, through a T connector 130 and is deposited within
chamber 26.
The Part B fixer which is supplied through conduit 110 is passed
into orifice 106 and hence is sucked into orifice 102 due to the
venturi action between orifices 98 and 102. Because of the proper
selecting of the orifice sizes, the amount of Part B fixer which is
intermixed with water is approximately forty percent within the
orifice 102. It is to be noted that the orifice sizes 98, 102 and
106 are substantially smaller in area by a factor of four than
orifices 100, 104 and 108. As a result, the volume of fluid which
is conducted within orifice 104 is approximately four times the
volume of fluid which is conducted within orifice 102. The
resultant solution within orifice 102 is conducted into conduit 132
and into T connector 130 and also is deposited within chamber 26.
The resultant overall mixture within the chamber 26 should closely
approximate 10 percent in volume of Part B fixer, 25 percent in
volume of Part A fixer and 65 percent in volume of water (or
adjusted as per chemical manufacturers' specifications). The
precise adjustment of this resultant overall solution can be
controlled by manually operating a restrictor valve 122 to control
the volume of flow of the solution being conducted through conduits
110 and 112. The volume of water which is being conducted into the
apparatus does not vary but is maintained constant as a function of
water pressure. It has been found that once the desired adjustment
of the valves 122 is accomplished, the correct volumetric flow
relationship is maintained within the mixed product located within
chamber 26.
It has been found to be necessary to dilute the tannic acid and the
sodium thiosulfate prior to intermixing of the two directly
together. If the two are mixed directly together, the sulfates will
be caused to precipitate out as a solid. This precipitation can be
avoided by first diluting the tannic acid and then depositing such
in the chamber 26, and also diluting the Part A fixer and supplying
such in the chamber 26. After they have been diluted and then
intermixed within chamber 26, there is no precipitate formed.
Referring particularly to the second mixing section 16, you will
note that there is no problem of any precipitate being formed and
therefore direct intermixing of all the components is accomplished.
The water is supplied through conduit 88 into opening 90 and into
restricted orifice 134 of 1/16 inch in diameter. Orifice 134
connects with enlarged orifice 136 of 1/8 inch in diameter. The
same venturi phenomenon is created at the junction of the orifices
134 and 136.
Intersecting adjacent this junction at a 45.degree. angle is an
orifice 135 which is also 1/8 of an inch in diameter. Orifice 135
communicates with conduit 138 which in turn connects with opening
140 in the block 116. Opening 140 is a tapered opening similar to
openings 114 and 118 and also includes an element 120 and a
restrictor valve 122. A conduit 142 is to supply an aldehyde
solution past the restrictor valve 122, into the opening 140 and
into conduit 138. The solution within conduit 138 is then deposited
within orifice 135 and is caused to be conducted within orifice 136
and intermixed with water therein.
Connecting at a 90.degree. angle at the junction of the orifices
134 and 136 are orifices 144 and 146. Both orifices 144 and 146 are
shown to be 1/16 in size in diameter. Another orifice 148
intersects at a right angle with orifice 144 and is also 1/16 inch
in diameter. In a similar manner an orifice 150 intersects at a
right angle with orifice 146 and is also 1/16 inch in diameter.
Orifice 148 connects with conduit 152. Orifice 150 connects with
conduit 154. Conduit 152 connects with tapered opening 156 formed
within block 116. Conduit 154 connects with tapered opening 158
located within block 116. It is to be understood that each of the
openings 156 and 158 has located therebeside it certain indicia to
represent the quantity of flow through these openings.
Additionally, each of the openings 156 and 158 also includes an
element 120 and also a restrictor valve 122. A conduit 159 is to
supply an acetic acid solution within the opening 156. A conduit
160 is to supply an activator solution into opening 158. It is to
be understood that each of the supply conduits 124, 126, 142, 159
and 160 will be connected to appropriate sources of supply which
will normally be located in a 1 gallon container, a 5 gallon
container or a 20 gallon container.
Referring particularly to FIG. 5 of the drawings, the overall
mixture which is produced within the orifice 136 will be conducted
to discharge conduit 162 and into chamber 24. Because the orifice
135 is located at a 45.degree. angle with respect to the water
orifice 134 and orifice 136 is larger than the water orifice, it
has been found that approximately 25 percent by volume of the
aldehyde solution will be produced with respect to the overall
volume of solution. Because the solution being conducted through
orifices 144 and 146 are at a right angle with respect to orifice
134 and are also the same size as orifice 134, it has been found
that approximately 5 percent in volume of each solution as compared
to the overall solution will be conducted within orifice 136.
Therefore, the overall volumetric relationship of the solution
being deposited within chamber 24 will be approximately 25 percent
aldehyde solution, approximately 5 percent acetic acid solution,
approximately 5 percent activator solution and approximately 65
percent water. Again, the final adjustment of the activator
solution, the acetic acid solution and the aldehyde solution is
accomplished through its particular restrictor valve 122 associated
with its respective tapered opening. Final ratios are to be
determined from chemical manufacturers' specifications.
It is readily apparent that the operation of the apparatus of this
invention is to install such in combination with an X-ray
processing apparatus. The appropriate lines are connected and
electrical power is transmitted to the solenoid valves located
within solenoid valve housings 64 and 66. During the time of
initial activation, the setting of the restrictor valve 122 is
accomplished to achieve the desired amount of flow through each of
the tapered openings of the particular solution being passed
through that opening. Once established, there should be no need to
change this setting.
As each film is processed within the film processor and the
appropriate pump is activated within the film processor to
replenish the particular bath, the fluid will be pumped from each
of the chambers 24 and 26. When the fluid within these chambers
reaches a sufficiently low level, the respective float 40 or 42
will cause activation of its respective float switch located within
either housing 54 or 58. Once the respective switch is activated,
the respective solenoids located within the solenoid housing 64 or
66 is activated. Upon activation of its respective solenoid, the
water is to be supplied to its respective mixing block 16 or 14. As
a result, as was previously described, the desired mixture would
then be produced and supplied within its appropriate chamber 24, 26
to replenish the loss of solution within the particular chamber. It
is envisioned that in most instances one chamber will be
replenished while the other chamber is not being replenished. This
is due to the fact that with the developing of each X-ray plate,
only approximately 65 cubic centimeters of developer solution is
used where approximately 110 cubic centimeters of fixer solution is
used.
It is considered to be within the scope of this invention to employ
other means in order to determine the level of the fluid within the
fixer reservoir tank or the developer reservoir tank. For example,
the floats 40 and 42 need not be connected to their respective rods
44 and 46. The floats 40 and 42 could include a permanent magnet
attached to the upper surface of each of the floats. The rods 44
and 46 would be eliminated as well as the actuating arms 48 and 50
with the mechanical switches within the housings 54 and 58 also
being eliminated. A magnetic proximity sensor would be mounted
within the housings 54 and 58 directly above their respective
float. Once the float reaches the predetermined lower level, the
magnetic proximity sensor will be activated causing admission of
water through its respective valve.
It is also considered to be within the scope of this invention to
employ an electrical probe arrangement which extends down into each
of the reservoir tanks. Since each of the fluids within each of the
tanks is capable of carrying a small electric current, upon the
current reaching a predetermined level based on the level of fluid
within its respective tank, a switch is activated. The switches
would be located in the respective housings 54, 58.
It is further considered to be within the scope of this invention
to supply both the fixer solution and the developer solution
directly into the X-ray processor. When such an arrangement is
employed and the film is put within the processor, the respective
valve is actuated for the particular type of fluid for a certain
period of time for which it is known that the desired quantities of
particular fluids will be supplied. In this arrangement, there is
no requirement for any reservoir tanks or the use of any
replenisher pump.
* * * * *