DE2521944A1 - MIXING DISPENSER FOR LIQUIDS - Google Patents

Description

DIPL.-PHYS. F. FINALLY D-ao34 unterpfaffenhofen PATENT ADVOCATE PO Box ^^

TELEPHONE (MUNICH) 84 36 SB PHONE

TELEGRAM ADDRESS: _M O _N CHEN CABLE ADDRESS: DIPL.-PHYS. F. FINALLY, D-8O34 UNTERPFAFFENHOFEN, POSTBOX

TELEX: 82 17SO

25219U

B-3716

Baldwin-Gegenheimer Corporation, Stamford, Conn., USA

Mixing dispenser for liquids

The invention relates to a mixing dispenser for liquids according to the preamble of the main claim.

The invention relates to a mixing dispenser for liquids, d. H. with a liquid mixing and distribution or dispensing device, in particular with a device that has a Solution produces which has a desired combination of ingredients or active ingredients, which then is supplied in a controlled or regulated manner to an intended end user. A main area of use of the invention forms the printing industry.

Offset printing machines generally come with a container or tank - generally the "water fountain pan" *; that with an aqueous solution of rubber Arabicum and a small amount of chromic or phosphoric acid. Bring the dampening rollers to the press

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this aqueous gumming solution on those not intended for printing Areas of the printing plate to the plate cylinder of the press, so that it is ensured that no color from the inking rollers on the moistened areas of the plate. The composition of the respective etching gum solution is determined by a number of factors including the type of color used, the type of print, the color of the print and the type of paper to be printed on.

It proved inconvenient to use large amounts of the A'tz gumming solution to produce and to store over long periods of time, since various types of deterioration in such storage may occur. On the other hand, some press operation conditions require a continuous one Supply of relatively large quantities of the gum solution. In order to take these two aspects into account, a device was created which, with automatic control, has a continuous replenishment of freshly mixed batches of the solution delivers, with the additional possibility given is to change the proportion of the ingredients in the mixture from time to time as it does from the different ones Product assignments is needed. An early embodiment of such a device is shown, for example, in U.S. Patent 3 l66 095 by the applicant, to which reference is hereby made is taken.

A critical element of any batch blender that was discussed Type is the metering or measuring device that is provided to accurately and reliably measure the amount of Etching gum concentrate to be added to a known amount of water to measure and set and to change that amount under the control of the operator. In the above mentioned US-PS J5 166 095 this is done by a dosing tank reached, which is intermittently fully filled with an etching gum concentrate. From this dosing tank only

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a certain fraction of the amount absorbed there, which is added to the aqueous solution, is deducted. At a Later development by the applicant, a similar effect is achieved through a repeatedly padded, open top provided tank which is floatable or floodable held in the aqueous solution that doses the concentrate is admitted. Located above the open top of the tank is a solid piston that enters the tank can if this is moved upwards. Such an upward movement occurs during operation of the device of the tank whenever increasing amounts of water are introduced into a receiving space for the water, the dosing tank surrounds. The resulting entry of the piston into the tank leads to a displacement of some Part of the concentrate and causes it to flow over into the surrounding aqueous solution. By a previously made Adjusting the vertical position of the piston allows the amount of concentrate to be adjusted in advance with an overall acceptable level Specify the accuracy that is released for mixing with the water when the water is at its maximum allowable Level reached. When the water reaches its maximum level, there is a batch of the solution with the desired composition generated for a delivery-for example by the operator or an automatic control-to the water basin or, alternatively, to a central reservoir, from which a distribution to a number made by presses is available.

The success with batch mixing of the type described above has been so great that it has been continuous Extension of the scope resulted. Simultaneously

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a need arose for a mixer dispenser that is even cheaper to manufacture and has even greater accuracy. According to the invention, this object was achieved by the subject matter of the main claim.

The above-mentioned requirements are met with the invention. The invention provides in a very compact arrangement (i) a metering storage chamber for the caustic gum concentrate or a corresponding concentrate and (ii) a mixing chamber in which the concentrate is mixed with the aqueous solution. the first of these chambers contains an overflow point above that a flow of the concentrate from the space containing the concentrate into the space containing the water take place can. A fluid delivery system is in conjunction with the dosing storage chamber is provided, this showing a tendency to maintain a fixed minimum level during normal operation of the device of the concentrate in the storage space. A movable one extends into the dosing storage chamber from above Piston, which with a downward displacement, which it increasingly immersed in the concentrate läat, the level of the concentrate up to the overflow point can increase so that this runs into the mixing chamber containing the water. The amount of concentrate overflowing depends on the amount of allowed downward movement of the piston. As in the following, in more detail detailed description of the invention, this size can be adjusted by the operator so that different water and concentrate proportions according to the varying operating conditions with the mixing dispenser connected printing press can be obtained.

The water to which the etching gum concentrate is added, is fed to the mixing chamber under the control of a float located in this chamber. This swimmer can also

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if connected to a control mechanism that enables it, the inflow of water into the chamber always then to start when the water level has reached a predetermined minimum value and then to stop the inflow, when a predetermined maximum level is reached. A device provides an operative connection between the swimmer and the displacement piston mentioned in the above connection with the metering storage chamber. By means of this facility the plunger will be made to plunge deeper into the concentrate if the level of the water rises during it is progressively withdrawn from the concentrate while the level of the water moves towards the allowable Minimum drops. In this way, the rise in the water level sets the metered supply of the etching metering concentrate to the mixing chamber in progress. In addition, the common arrangement of the main operating parts described above, As will be seen in more detail below from the description, a very compact and inexpensive structure of the entire device.

With the invention, a mixing dispenser is created which has a one-piece container, which is a first Forms chamber for receiving a primary liquid and a second chamber for receiving a secondary liquid. In a float device is attached to the first chamber, which serves to facilitate the introduction of the primary liquid into to control the first chamber and the release of the same. The same facility is also in connection with a piston which is arranged so that it can be immersed in the secondary liquid. Through this connection it is achieved that an increase in the liquid in the first chamber lowers the piston in the second chamber, with the result that a metered amount of the liquid flows into the first chamber, where the two liquids are mixed.

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An adjustable locking device is also provided, which limits the degree of immersion of the piston and thus changes the amount of secondary fluid that is passed through Displacement is brought into the first chamber.

Further details and advantages of the invention will become apparent from the following description with reference to the accompanying drawings.

1 shows a perspective illustration of an external view of an embodiment of the invention.

FIG. 2 shows an enlarged plan view of the one shown in FIG. 1 Device with part cut away from the structure of the top.

Fig. 3 shows a section along the line 3-3 of Fig. 2, wherein however, in this case all elements of this figure are shown in full.

FIG. 4 shows a partial section along the line 4-4 of FIG. 2.

FIG. 4a shows, on an enlarged scale, a plan view of a segment of certain elements of FIG.

Fig. 5 shows a section along the line 5-5 of FIG. 3, "wherein an upper part is omitted.

Fig. 6 shows a section along the line 6-6 of Fig. 3.

Fig. 7 shows in a schematic representation an arrangement of certain of the components shown in Fig. 1 with 5, which perform the essential functions.

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Pig. 8 shows, in an enlarged illustration, a detail in section and partially broken away from a part of the area on the left by Pig. 4 structure shown.

FIG. 9 shows a section along the line 9-9 of FIG. 8. FIG. 9A shows a section along the line 9A-9A of FIG.

FIG. 10 shows an offset section along the line 10-10 of FIG. 8.

Fig. 1 shows the external shape, which shows the main components of the invention in the assembled state and in their normal Assume operating position. This arrangement holds at its base portion a container or tank 10 which is so shaped is that it is self-supporting on any flat surface. In one embodiment of the invention, which is considered to be preferred in that it saves costs in terms of both material and Is manufacturing cost, the tank 10 consists of a one-piece molded container liquid- and corrosion-resistant plastic material, for example polyvinyl chloride. At its top is it is provided with a circumferential, outwardly facing projection 15, which, as shown in Fig. 4, something from the Level of the vertical container wall can be offset so that an inwardly projecting edge 17 is formed, which holds a cover plate 20.

On the cover plate 20 there is an inverted container 30, which, as will be explained in more detail below, so is designed to have a reservoir from a capacity of 3.79 liters (1 gallon) to several times that amount for a concentrated etching gum solution or other

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concentrated solution, which during the operation of the Device water or another suitable diluent or solvent should be added, for the present Suffice it to say that the container 30, as shown, is a watertight and airtight arrangement contains, which consists of a cylindrical plastic side wall 32, a non-pierced end wall 34, a generally corresponding end wall 36 on the opposite End as well as receiving devices or tie rods 38, which serve to connect the end walls with the cylindrical To hold the side wall 32 together in a fixed arrangement. In the inverted position that the container 30 assumes, it contains a downwardly directed outlet system 40, which will be described in more detail at a later point in time.

Furthermore, two removable, but normally not fastened housings 44 and 46 are held on the cover plate 20, which housings enclose electrical and mechanical control devices which will be described in more detail at a later point in time. A water supply pipe 48 .. is furthermore, as will become apparent from the later explanations, operationally connected to the cover plate 20, whereby it passes through it. 1 also shows a control ^{device dnun} S 50 which, as will be shown, plays an essential role in the control or regulation of the proportions of the liquid mixture which the device 10 is to produce. At the right end of the arrangement there is shown a liquid outlet line 60, which will also be returned to later.

It can be seen from Fig. 3, in which a large number of the above-described components can be readily seen, that the tank 10, seen in longitudinal section, contains a first relatively large liquid receiving chamber 7o, which contains the larger area

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occupies the right part of the container and has wings

and leg portions 70a, respectively, extending to the left end of the structure. The task of the liquid holding chamber 70 is to hold a substantial amount of the primary liquid (e.g. water) which is mixed with a secondary component, such as an etching gum concentrate, in the course of operation of the device. To the left of the liquid holding chamber, but in the immediate vicinity of the same, there is a second smaller chamber 75, the wall structure of which is formed continuously with the wall structure of the liquid holding chamber 70. This second chamber serves to receive the secondary liquid or the concentrate from the container 30. This second liquid is introduced into the chamber 75 from the container via the outlet system 40. The details of this exhaust system are essential to the effect of the present invention, so they will be described in detail at a later point. For the moment it will only be noted that the exhaust system includes a primary outlet 252 through which the downflowing liquid from container J> Q is introduced into the chamber. The combination of the inverted container J> 0 \ XLiu and the outlet system 4o provides a system for maintaining a fluid level of the type sometimes referred to in English as a "chicken feeder". In such a system, the equilibrium between the partial negative pressure existing in the upper region of the container J> 0 and the weight of the column of liquid attempting to pass through the outlet 252 causes a substantially constant liquid level in the chamber 75, as indicated by the reference numeral 78 is shown.

Looking at FIGS. 2 and 3 together, it can be seen that the chamber 75 is an open-topped basin that

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contains a bottom wall 75a, which has a significant distance between itself and the base of the overall tank 10 provided for the holder. The basin is connected on three sides with its boundary walls to the boundary wall of the container 70 via a horizontally extending region 75b and opens into this. As more clearly seen in FIG 5., To close the projections 70a of the side walls extending the liquid receiving chamber 70 along the chamber 75> where they enclose this practical. It can be seen that, due to this arrangement, the chamber 75 has an overflow point, over which the liquid 78 contained in the chamber flows the delimiting surface 75b and falls into the larger mixing or liquid receiving chamber 70. The significance of this arrangement and the device with which an overflow from the chamber 75 into the liquid receiving chamber 70 can be achieved will be explained in more detail later.

First of all, the liquid supply device will be discussed , by means of which the liquid in the chamber 70 between a predetermined minimum level and a predetermined maximum level is maintained. This facility contains as an essential component for their operation a float 80. The float 80 consists of a body of a material with a significantly lower specificity Weight than water. This body can - for example, a solid one Block made of a polyvinyl chloride foam with a closed cell structure. On the top surface of block 80 is a plate 82 made of stainless steel is provided which, inter alia. serves as a weight to enable the block to to act as a counterweight in a manner to be explained in more detail.

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You can best recognize it from Pig. 6 that on the plate 82 an upwardly projecting U-shaped bracket 85 by means of visual screws which stand in the float 80. This bracket contains vertical legs 85a and a cross yoke 85b, that connects these legs. In the middle area of the transverse yoke, a slot 85c is made, which is at right angles extends to the axis of the transverse yoke (see Fig. 4a).

From Fig. 6 and also from Fig. 4 it also follows that over the central region of the float 80 and inside the on the cover plate attached housing 44 a two-way toggle switch 88 is provided, the one with a voltage source connected contact 88a and two alternatively usable contacts 88b and 88c, which, as will be explained in more detail, connected to ground via separate solenoid valve controls are. This switch belongs to the class of switches that are tilted over the middle, with its active switching element 88d is connected to a movable actuating head 88f via a spring connection 88e. Between the switch 88 and the float 80 is an operative connection by means of a push rod 90, in which the push rod 90 with its upper end on the switch operating head 88f via a connecting structure 91 is attached, which cooperates with a fixed bracket 92 or a fixed bracket. The push rod 90 extends down through the slot 85c in the cross yoke 85b (see Fig. 4) so that its lower end approaches the plate 82 without, however, with to come into contact with this. In the middle area of the push rod 90 there are circular sleeves or circular rings 93a and 93b fastened in this way - for example by means of pestle screws that their relative positions by the operator of the device can be set or specified in advance. It can be seen that with this arrangement of the components in

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Case of upward movement of the float 80 - d. H. during a period in which water from a supply source of the Liquid receiving chamber 70 is supplied - a point is reached is, as shown in Fig. 4, in which the cross yoke 85b engages the circular sleeve 93b and the push rod so shifts so that the actuator head 88f (see Fig. 4) pushes into its uppermost position. As a result, the contact 88a connected to the voltage source is in contact with the Connection 88c brought. As a result, what will become even more apparent from the following description of FIG. 7, simultaneously the water supply to the liquid receiving chamber 70 is interrupted and the outflow of water from the bottom thereof Chamber started so that the level of the water in the chamber drops. As already mentioned, switch 88 is of a type in which the switchover via the. Middle occurs, does not affect the drop in the water level instantaneously the switching status of the switch. However, if the float 80 has dropped significantly as the water level decreases is reached, a point is reached at r? em the cross yoke 85b in contact occurs with the upper surface of the circular socket 9 ^ a, so that the push rod is pulled down. As soon as this happens the switch 88 is thrown to its other position, with the contacts 88a and 88b resting against one another. Under these Under certain circumstances, as will be explained in more detail later, the outflow of the water from the liquid receiving chamber 70 is stopped, further fresh water begins to flow in again. This cycle lasts indefinitely until canceled by the operator the system is interrupted. It is understood that the maximum level and the minimum level that the water will occupy can be done in advance by moving it up or down of the circular sleeves 93a attached to the push rods and 93b can be determined. In general, the maximum Level each set in such a way that it is at a certain level

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Point is clearly below that in Fig. 4 with 75b designated overflow point of the second chamber 75 is located. The minimum level is chosen at least so high that the float 80 is prevented from hitting the bottom of the liquid holding chamber 70.

Before the operation of the device described so far is explained in the following, the area shown on the right in FIG. This device contains a lever arm 100 which is articulated on the end wall of the device housing, as indicated by the reference numeral 102. The lower end of the lever arm, which is biased to the right by means of a spring, carries a frustoconical, partially hollow cap or cover part 105. In the position shown in FIG Has a central opening which leads to the outlet line 60. When the lever arm 100 is rotated clockwise about the pivot point 102, the cap part 105 necessarily moves away from the sealing cuff 107 so that water can flow from the liquid receiving chamber 70 into the conduit 60. In order to prevent the cap part from being sucked onto the sealing cuff 107, the latter is provided with an opening at its upper edge through which the line 60 can be vented into a vertically running channel 112 which extends beyond the level which is located in the liquid storage chamber 70 Can take maximum liquid. The flow of liquid into line 60 and through it to an end user station, for example

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to a press spray device (press .fountain) be accomplished either by gravity or by a pump connected to the line.

The overall operation of the water level control system thus far described can best be summarized with reference to Pig. 7 explain, in which the individual components mentioned above are provided with corresponding reference numerals. The one in Pig. 7, the water level in the liquid receiving chamber 70 has reached the prescribed minimum value and the float 80 assumes the lowest position that it can assume in the indicated position of the circular sleeve 9j5a acting as a stop. Under these circumstances, it can be assumed that the switch contact 88a has snapped from the position shown in broken lines, in which it is in engagement with the contact 88b, to the position shown in FIG. J in full lines. This changeover process means that the solenoid 120 - which in the energized state holds the lever 100 in the position shown by dashed lines - is de-energized. This means that the cap part 105, which acts as a closure, comes into engagement with the sealing collar 107,

ü. H. it takes the ones in the drawing with the fully extended Position shown in the lines. The pouring out of the water to the outlet line 60 is thereby terminated. At the same time, the normally closed solenoid valve 125 is excited, so that it goes into the open position. This allows water to enter the liquid receiving chamber 70 via the supply line 48 flow in, of which a part denoted by the reference numeral 48a extends into the lower region of the chamber. The inflow caused by this causes the water level in the liquid receiving chamber 70 to rise, as a result of which the float 80 is moved upwards. This process continues until the switching contact 88a changes to the contact 88b.

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snaps. At this point, the solenoid valve is again de-energized while the solenoid 120 is energized so that a new cycle of draining and replenishing begins. This process continues until the device is switched off as a whole by opening the main switch 1 ^ 0. if one compares the various figures of the drawings, one recognizes that in a part of the same - in particular in Fig. 1 and J - the mechanical arrangement of components such as solenoid 120, solenoid valve 125, and switch 1 ^ 0 is shown which were mentioned for the first time in the description of FIG.

After the foregoing full description of the control of the water level in the liquid chamber 70 The system used is to be described in the following, by means of which this system furthermore a Control of the supply of metered amounts of the etching gum solution from the second chamber 75 causes. For this purpose, reference is made in particular to FIGS. J5 and 6. From this you can see that each of the vertical legs 85a attached to the float are attached with a pair of spaced apart Pivot pin l4o and l4l is provided. Lever arms 145 are rotatably attached to the upper pivot pins 140. The lever arms 145 are also rotatable at a fixed pivot point attached, which is formed by a pin or a bolt 147 is. Each of the bolts 147 is in its position by a vertical Arm 148 held, which, as indicated by the reference symbol I50, is securely attached to the top plate 20 of the assembly. Each of the lever arms 145 extends a certain amount Stretch to the left from the pin 147 serving as the pivot point, connecting it near its left end with an upwardly directed Groove or recess 155 is provided. One can best see by looking at FIGS. 2 and 3 together, that the grooves 155 engage from below with a horizontal

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zontally extending support rod 160 occur, the effect of which will be explained in more detail below.

If one looks again at FIGS. 3 and 6 together, one recognizes one that on each of the vertical legs 85a a second lever arm 165 pivotally attached via one of the pivot pins l4l is. This second lever arm 165 extends between the vertical leg 85a and the arm 148, whereby it is on the latter pivoted by means of a pin or bolt I70 is. From the sectional view of Fig. 4 it can be seen that that the two identical lever arms 165 are connected at their right ends by means of a connecting web 165b, with which they together form a U-shaped arrangement, the open end of which is directed to the left as seen in FIG. The combination of the fixed, vertically extending arms 148, the lever arms 145 and I65 and the one on the float attached vertical legs 85a provide a pantograph assembly at both opposite ends of float 80, which is to ensure that the vertical legs 85a are each perpendicular to the bottom of the liquid receiving chamber 70 as the float moves up or down. This in turn leads to the major surfaces of the float remain parallel to the bottom of the liquid receiving chamber 70. This prevents the The float assumes an angular position through which it comes into frictional contact with any of the wall surfaces of the chamber could. As a further result of this arrangement, the horizontally extending cross yoke 85b exercises the attached to the float Arm system necessarily exerts a completely vertical force on those attached to the push rod 90 Circular sleeves 93a and 93b. Of course, the pantograph bracket described above causes a certain rightward displacement of the float 80 when it rises from the lower position shown in FIG. 3 upwards,

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as well as a corresponding shift to the left if it is in the subsequent phase of operation drops again. Because of the, as can be seen from Fig. 4a, mounted in the cross yoke 85b elongated slot 85c, this movement does not lead to serious bending of the push rod 90.

In the following, the device will be described by means of which the movement of the float 80 is enabled, a metered delivery of the etching gum concentrate or one carry out another activating liquid from the second chamber 75 into the liquid receiving chamber 70. This is done Reference is made to FIG. 4. It can be seen from FIG. 4 that a displacement block above the right-hand area of the second chamber 75 or piston 200 is attached which, as can be seen, has a generally square cross-section in the transverse direction having. The other relative dimensions of the block can be seen in FIG. The block only extends over part of the area of chamber 75, leaving sufficient clearance for exhaust system 40. Of the Displacer block 200 is formed from a suitable liquid-resistant material, according to a preferred one Embodiment contains a high-density polyvinyl chloride with a specific gravity of 1.4. Because of the last named property he shows the tendency to sink in the liquid 78 contained in the chamber 75, if he is not held by other means apart from the buoyancy in the liquid. The one actually used The mounting device initially contains the horizontally extending and shown in Fig. 2 retaining rod I60, to which the displacer block 200 is attached by means of eyebolts 2 05 attached at a distance from one another. The openings these eye bolts are dimensioned so that they allow free pivoting of the displacement block on the bracket

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^'18 "25219U

enable stab l60.

The support rod itself has two separate support devices. The first of these contains the pair of with grooves in the end area provided lever arms 145. The second bracket contains another pair of lever arms 210 which, as can be seen from FIG. 2, are combined into a U-shaped arrangement by means of a cross piece 210b, which is located between them at their right ends extends. The arrangement is provided with oppositely attached pivot points, which by projections of the Pins 147 are formed, which in the downwardly extending Arms 148 are supported. This arrangement causes downward movement of the crosspiece 210b a lifting of the ends carrying the displacer block of FIG Lever arms 210. These ends are in turn provided with upwardly directed grooves 210a which are designed so that they take up the ends of the support rod I60.

It is the task of the lever arms 210, in cooperation with additional devices described below possible downward movement of the displacer block 200 independently of the maximum upward movement of the float 80 and thus a controlled change in the secondary liquid caused to overflow from the chamber 75 by the piston to reach. This is achieved without at the same time changing the total amount of primary liquid which is in the liquid receiving chamber is fed. This is done by a device controlled by the operator for the setting the extent to which the left ends of the lever arms 210 - as can be seen from FIG. 4 - from the weight of the displacer block 200 can be pulled down. The device specially provided for this purpose contains a round or circular one Locking member 220 attached to the lower end of a vertical adjustment rod 225. This locking link occurs

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as best from Pig. 4 can be seen in engagement with the upper surface of the cross piece 210b which connects the levers 210 when this cross piece reaches a certain height. This height can be varied downward according to the extent of the adjusting rod 225. As soon as the parts are in Are engaged, the downward movement of the ■ displacement block ends 200 necessarily, regardless of the depth its immersion in the A'tz gumming solution 78. Assume that a certain amount of this solution is in the chamber 75 before the downward movement of the displacer block 200 begins. Limiting the downward movement of the displacer block therefore automatically determines the proportion of this amount that is forced across the interface 75b to flow. This allows the amount of concentrate that is in the liquid received by the chamber 70 for the purpose Mixing flows, can be effectively dosed.

It can also be seen from FIG. 4 that the adjusting rod 225 is supported on the cover plate 20 of the container by a socket with an internal thread. The adjustment rod engages with a on her attached external thread in this internal thread. An actuating button 228 is attached near the upper end of the adjustment rod, through which the adjustment rod is in the socket 227 can be screwed up or down. A pointer 229 * which is also attached to the upper end of the adjustment rod are - even if it cannot rotate - works with this with a scale of 2 ^ 1 together. The markings of the Scale correspond to suitable fluid measurements - for example ounces per gallon or grams per liter - so that the position of the pointer can be recognized after an initial calibration of the system gives how much liquid is displaced from the chamber 75 during a single operating cycle of the device. These Quantity can be increased at any time by adding the

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Actuator knob 228 rotates so that the locking member 220 is raised by an amount determined by a change in the Position of the pointer 229 is displayed. Conversely, the amount can also be reduced by moving the locking member downwards emotional.

The process has been described above how the lever arms 210 and the locking member 220 jointly define the movement limits for the displacer block 200. Hereinafter it should be shown that the occurrence of such a movement is primarily due to the action of the lever arms 145 depends. Let it be in this context, for example Assume that at the end of a fill and mix cycle, the device is in a condition shown in FIG is. It can be seen from this representation that the swimmer 80 is at a high level, which is what the achievement of corresponds to the maximum desired level of the primary fluid. Under these conditions, the lever arms 145 have the support rod 160 released what they can do, since upwardly open grooves 155 are attached at their ends, by means of which causes the engagement of the arms and the support rod will. The displacer block is therefore only held by the independent lever arms 210. It is now assumed that In the next operating phase of the device, all of the liquid is removed from the liquid receiving chamber 70 .. During such drainage the liquid sinks the float 80 decreases so that the left ends of the lever arms 145 rise. At some point the grooves occur 155 re-engages the support rod I60 so that they take this over from the lever arms 210. In the preferred mode of operation of this system, the displacer block is of the Lever arms 145 raised - d. H. he becomes by sinking of the float 80 actuated - until it is almost - but not

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completely - leaves the surface of the liquid in the chamber 75. A complete pulling out of the displacer block from the liquid is undesirable, since otherwise in a subsequent to such a withdrawal Operation the piston would have to move an indefinite distance before it would begin, the level in the chamber 75 located liquid to lift. This would reduce the maximum achievable displacement of the liquid will.

From the previous description of the device it can be seen that, with the exception of the sealing collar shown in FIG for the outlet line 6o and the parts 100 to 105 which work together with this outlet, all participating in the operation Components of the device are held on the cover plate 20. The cover plate 20 is, as already mentioned, of the projecting edge 17 supported, which is formed within the upper edge region of the container. The cover plate 20 is also supported by a pair of U-shaped bracket arms 2 ^ 5 supports - see Figures 3 and 4 - that are so arranged are that the closed part of the U rests on the bottom of the liquid receiving chamber 70 in any case. Because of servants Arrangements can be the combination of the two chambers 70 and 75 as a one-piece structure of a molded liquid-resistant Form plastic material, for example from Polyvinyl chloride, which is formed from a sheet-like or plate-like material by vacuum deformation. Even the plane Cover plate 20 can be formed from the same material. The cost of these major components of the device is therefore favorably low. In addition, the attachment of the various participating in the operation Carry out components of the arrangement on the cover plate 20 easily or quickly, with only a minimal production

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time is necessary, so that the device as a whole is considerable is cheaper than the previous devices for the production of etching gum solutions.

It goes without saying that the container 30 for the secondary liquid, that is to say the etching gum concentrate, can be lifted off the cover plate 20 as a whole at fixed intervals and filled with fresh material. This is not only necessary to refill the empty container, but also to avoid a deterioration in quality which would occur if the materials remained there unused for very long periods of time. The exhaust system 40 used in connection with container J> 0 is described in a separate U.S. application. Since it has special advantages in connection with the present device, it will be explained in detail below. Reference is made to FIGS. 8 to 10 in this regard.

The outlet assembly 40 can be removed as a whole from the end wall of the container, which is by means of a thread 241 happens, which is attached to the upper end of a hollow cylinder that forms the enclosure of the assembly. This Thread is in engagement with a corresponding internal thread of an orifice sleeve 30b, which is attached to the end wall ^ 6 of the Container is attached and extends downward through a suitably dimensioned opening in the cover plate 20. A sealing ring 24la creates a seal between the end of the orifice sleeve 30b and an annular flange 242a, which is attached to the outer surface of the cylinder 242. The threaded end of cylinder 242 encloses in tight fit a second cylinder or sleeve

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a>

OO
rO

" ²⁵ ~ 2521

which has an inwardly tapered or recessed end surface 2435a. This training is for the purpose of receiving a fitted Closure part or plug 244 hit, which in turn on an extending in the axial direction Push rod 246 is attached. This push rod has such a length that when the container J50 on the top plate 20 - as shown in Fig. 8 - with the lower end thereof in engagement with the bottom of the chamber 75 occurs as shown at point 246a. The plug 244 is therefore defined by the tapered end face 24ja pushed away so that the liquid in and through the cylinder 242 can flow. On the other hand, when the container is removed from the assembly - be it for refilling or to be closed another ^ wake - causes a pressure spring 249 suitably attached to the lower end of the push rod that the push rod Immediately move the stopper to the closed position so that the container can be lifted and reversed, without any liquid escaping. As such, this feature is not new. At the lower end of the cylinder 242 however, a new device is provided which controls the release of the liquid so that it enters the chamber 75 can flow. This device includes a cylindrical block 250 which fits into the bore of the hollow cylinder 242 is. This block contains a central opening for the push rod 246, as well as two additional circular openings 250a and 250b. The first of these openings takes a tube 252 that with the illustrated orientation of the device is down below the desired liquid level 78 extends in chamber 75 and forms the main outlet for the liquid from container JO into the chamber. The opening 250b receives a second tube 254 in its upper end, the at its upper end, as represented by reference numeral 254a, is bent and closed and its side wall in the bent area is a relatively small circular one Has opening 255. The opening provided in this way stands

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the liquid in the cylinder 242 in connection with the main amount of the fluid located in the chamber 75 ″, not only via the lower end of the opening 250b but also through a small lateral opening 256, the center line of which is at the desired equilibrium level of the liquid surface 78. The effect of this arrangement is first of all that as long as a supply of the liquid concentrate remains in the container 30, the level of the liquid held in the chamber 75 tries to adjust to approximately the center of the opening 256. that as long as the liquid surface is above the level mentioned, the air inlet to the container 30 through the still exposed part of the opening 256 to r.obr is covered or narrowed - by the surface tension of the water or in some other way - so that air bubbles in the Hollow cylinder 242. Therefore, no air gets into the upper area of the container ters 30, so that a partial negative pressure arises in this area, which prevents further leakage of the liquid into the chamber 75 either via the tube 252 or via the opening 256.

It will be understood, however, that as soon as the displacer block - see FIG. 4 - is sufficiently lowered to a noticeable amount of the Liquid concentrate to overflow into the liquid receiving chamber 70 in order to mix with the one located there To bring liquid, after a subsequent repeated lifting of the same by the weight of the swimmer - which takes place after the solution has been withdrawn from the liquid receiving chamber - the one remaining in the chamber 75 Fluid will drop below its original level if not replaced. As soon as this begins, however, it will the opening 256 is completely released, so that a flow of small air bubbles from this opening through the opening

50985 0/0692

~ ²⁵ ~ 25219U

voltage 255 can reach the upper region of the container 30. In this way, the negative pressure in the container is released so that liquid can escape through the tube 252. This The process continues until the liquid level in chamber 75 reaches the center of the opening 256 again. At this point the air flow ends and the setting occurs again a state of equilibrium.

The fluid control system described above has particular advantages in that it always avoids that a large surge of air occurs or a correspondingly large one A surge of liquid emerges. This means that the succession of small air bubbles that are in the constricted by result in the specified flow path for openings 256 and 255, together with the restricted liquid flow path through the pipe 252, the formation of stronger gushing effects avoids, as they often arise with vacuum-controlled liquid dispensing systems. On the other hand, this prevents such a vigorous occurrence of surge and wave formations in the liquid level of chamber 75, daü could lead to the liquid concentrate on the Wall surface 75b - see FIG. 4 - spilled over and in this way unpredictable changes in the composition the solution formed in the chamber 70 causes. It is believed that it is necessary to understand such an operation is sufficient if the statement is made regarding the size of the openings 256 and 255 under the opening in the pipe 252, that these are relatively small in relation to the cross-section of the main channel in cylinder 242. Particularly favorable results resulted in a construction in which the cylinder 242 has an internal bore with a diameter of approximately one inch (1 inch) and openings 252, 255 and 256 a width of 6.35 mm, 6.35 mm and 9 * 52 mm (1/4 inch, 1/4 inch, 3A inch) exhibit.

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The invention has been described above with reference to a specific embodiment. It goes without saying the skilled person is able to make numerous modifications, without departing from the basic idea of the invention. For example, it is possible to use the swimmer for certain purposes 80 to be divided into two independent float parts, one of which is to switch the water supply on and off controls while the other operates lever arms 145 and I65. A coordination of these punctures is of course maintained by the fact that the two parts of the float move in synchronism with the rise and fall of the water level in the liquid receiving chamber 70.

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Claims (10)

Claims fl, mixing dispenser for liquids, especially for pressure. Industry, characterized by a first chamber (70) for receiving a primary liquid with a first inlet and switchable liquid supply device (48), with a device (8θ) which reacts to changes in level of the Primary liquid in the first chamber (70) responds, with a control device (88, 93a, 93b, 125) for the Liquid supply which is in operative connection with the device (80) that it is in a fall of the Liquid levels in the first chamber (70) to a minimum level the first liquid supply device (48) switches on and when the maximum liquid level is reached, the feed device switches off and with an outlet control device (88, 93a * 93b, 120) when the maximum liquid level is reached in the first chamber (70), the liquid flows into a consumer line (6o) lets flow, while another outflow when the minimum liquid level is reached prevented, with a second provided for receiving a secondary liquid chamber (75), which is adjacent is attached to the first chamber (70) in order to mix metered amounts of the secondary liquid with the primary liquid, with an overflow (75b) to the first chamber (70) and with a second liquid supply device (4θ), that a constant minimum level of the secondary liquid in the second chamber during the operation of the device (75) maintained by a displacement device (200), which extends down into the second chamber (75) and S09850 / 0692 25219U in the vertical direction between a raised position, in which they completely or almost completely the secondary liquid has left and a lowered position is displaceable in which they have a sufficient amount of the secondary liquid displaced in such a way that it flows via the overflow (75b) into the first chamber (70) and through a device (145, 160, 210, 220, 225), which brings the displacement device (200) into its raised position when the liquid level in the first chamber (70) falls while it is the Brings the displacement device (200) into its lowered position, when the liquid level in the first chamber (70) increases. 2. Mixing dispenser for liquids according to claim 1, characterized in that that the device for changing the level of the primary liquid in the first chamber (70) is a float (80) and / or that the displacement device is a piston (200). 3 · Mixing dispenser for liquids according to claim 2, characterized in that that the device for moving the displacement device is in operative connection with the float (80) indicates that the displacement device (200) is raised when the float is lowered and lowered when it is raised will. 4. Mixing dispenser for liquids according to claim 3 * characterized in that that the connection between the float (88) and. the displacement device (200) contains a lever (145), which engages with one end on the float (80) and with the other end on the displacement device (200) and that the Lever (145) is pivotably mounted between its ends at a pivot point (147). 609850/0692 25219Λ4 5 · Mixing dispenser for liquids according to one of the preceding claims, characterized by an adjustable device (210, 220, 225), which determine the downward movement of the displacement device (200) independently of the maximum up · upward movement of the float (8o) for the purpose of controlling the metered delivery of the secondary liquid without simultaneous Change in primary fluid supply is limited. 6. Mixing dispenser for liquids according to claim 5> characterized in that the adjustable device contains a lever (210) pivotably articulated in the central area, whose one end (210a) limits the downward movement of the displacement device (200) and the other end with a by an operator controllable device (220, 225) cooperates in such a way that thereby the position of the lever and thus also the lower limit point for the downward movement of the displacement device (200) is set. 7 «Mixing dispenser for liquids according to one of the preceding claims, characterized in that a container (10) "'contains the first chamber (70) and the second chamber (75) and that a wall area (75b) separates the two chambers from one another separates, wherein this wall area is designed ■ that the liquid of the second chamber (75) when exceeded of a certain level flows into the first chamber (70). 8. Mixing dispenser for liquids according to claim ¹ J, characterized in that the first chamber (70) and the second chamber (75) are integrally formed from a homogeneous material. 9. Mixing dispenser for liquids according to claim 8, characterized in that 609850/0692 - "50 - indicates that the homogeneous material is a molded, liquid-resistant plastic. 10. Mixing dispenser for liquids according to one of the preceding claims, characterized in that the displacement device (200) occupies only part of the transverse region of the second chamber (75) and that the second liquid feed device contains an inverted container (JO) which is above the second chamber (75) and has a downwardly facing outlet system (4o) which extends into the second chamber (75) at a location not occupied by the displacer (200), the outlet system below the normally in the second chamber the surface occupied by the secondary liquid extends. 609850/0892 Blank page