DE1932805A1 - Pressure controlled coffee machine - Google Patents

Description

ing. B. HO ^- LZEE

RO AUQSBURO

Augsburg, June 27, 1969

Westinghouse Electric Corporation, j5 Gateway Center, Pittsburgh, Pennsylvania, United States of America

Pressure controlled coffee machine

The invention relates generally to vending machines, especially vending machines that serve hot coffee in cups.

Coffee machines are enjoying general popularity and where to find them in public buildings, factories, railway stations and When encountering plug-in waiting rooms, they are almost constant in operation »They must therefore be built to be robust and easy to use

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909881/11 SO

operate and be reliable in operation. ,, ...:

The invention is intended to solve the problem, With such machines a “quiet, even and reliable operation of the brewing mechanism for the coffee achieve and with a minimum of. get along with additional maintenance.

In terms of solving this problem, the invention includes a pressure medium-controlled coffee machine, which are characterized by the combination of the following features is :.

a) a base plate with a ß over a Ausi

for the coffee that has been brewed and with a j sealing ring body and an upright brewing cylinder open on both sides, which is arranged above the base plate and in its rest position with its lower edge slightly above the base plate completes in the brewing position but with its lower edge sealing against the The sealing ring is pressed,

b) an actuator assigned to the brewing cylinder,

^{_:: -;} , ■: · "904801/1 ISO '.', ^ ■"";:"

c) a closure for the upper opening of the brewing cylinder,

d) a further actuator assigned to this closure,

e) Auxiliary devices for feeding measured quantities of ground coffee and hot water into the Brewing cylinder,

f) a pressure-exerting pressure that interacts with the brewing cylinder Facility,

g) Auxiliary equipment for removing the coffee grounds from the filter disc and.

h) a program control that works with each brewing cycle in chronological order, the actuation of the first-mentioned actuator is initiated first, that brings the brewing cylinder into the brewing position, then the actuation of the auxiliary devices for the Allocation of coffee and water triggers, then the actuation of the second-mentioned actuator for placing the closure and thus the sealing the upper opening of the brewing cylinder, then the actuation of the pressure-exerting devices

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introduces the compressed air into the brewing cylinder guide, then causes the actuation of both actuators, which on the one hand the Bring the brewing cylinder into the rest position and, on the other hand, remove the sealing cap from the upper one Return the opening of the brewing cylinder and finally causes the actuation of the auxiliary device for the removal of the coffee grounds.

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A clearer picture of the invention emerges from the following description of preferred embodiments of the same with reference to the accompanying drawings represent the followingϊ

Fig. 1 is a partially sectioned side view of a AufbrUhmechanik according to the invention, with the various parts of the apparatus in their respective Rest position are shown, which they take each before the start of a brewing cycle,

Pig. 2 one of the pig. 1 similar view that

■■■. however only the actual coffee

brewing device without the control means shows the various

9CK9Q8 1/1 150

Parts are shown in the positions they used in the initial stages take a brew cycle,

Fig. 3 is a front view of the invention Coffee brewing device with a schematic representation of the auxiliary equipment for the supply of ground coffee and hot water in a brewing cylinder,

FIG. 4 shows a representation similar to FIG. 3,

in which the closure is shown in a different position.

Fig. 5 is a partial view of the lower part

of the brewing cylinder with a wiper blade in a position from which it can drain away the coffee grounds;

6 shows a view corresponding to FIG. 1

a modified form of pressure feed for the coffee brewing machine,

909 881/1150

• Fig. 7 is a view according to PIg ₈ 1 with a

another modified form of pressure feed,

FIG. 8 shows a view according to FIG. 7, but with

modified devices for supplying pressure to the brewing cylinder, and

Fig. 9 is a view according to FIG. 1 with a

modified program-controlled valve.

The air-operated brewing device according to Invention for individual cups of coffee is to be used in particular in coin-operated machines for coffee in which there is not only is the brewing device, but also a number of other auxiliary devices, for example a

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Coin acceptor and changer, a hot water heater, container for cream j. Sugar, chocolate powder, Soup powder, a cup dispenser, a mixing device for mixing the brewed coffee with cream powder and / or sugar; and steam discharge it arrangements. As all of these additional Devices do not and do not form part of the invention. considered necessary to understand the invention

9098 Ö1 / 115 0

only the brewing device will be discussed below of the coffee and the associated control devices shown.

In the drawings, a sheet metal housing 10 is shown with two vertical wall parts 11 and 12, between which there is an approximately horizontally extending base plate which receives a filter disk 14 which is arranged over a funnel-like shaped outlet for brewed coffee. The outlet consists of a relatively wide collecting section below the filter disc 14 and an outlet opening 15 * which passes over a line 16 which merges into a mixing device (not shown) in which the finished coffee with cream and / or sugar is added. Customer request is mixed. The cross section of the outlet opening 15 for the finished coffee is relatively small compared to the cross section in the collecting part of the outlet immediately below the filter disc 14 15 changes, the design of this outlet opening affects to a certain extent the taste of the finished coffee, which is of course also determined by the size, shape and number of openings in the filter disk 14. "To the filter disk 14._

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. - "makes a seal ring 17 around which the lower end of _the: cooperates Aufbrühzylinders-20 and this"^'! seals during the brew cycle. "'' * · - ■■ -""■ · ■■ '■■ - ·'"

The brewing cylinder 20; becomes at .21-sehwenkbaf ah ';'·'"Arms 22, and 24 supported, which in turn - on the housing 10 - 'at 2j5 and., - 25 pivotable, arranged slndv' guides with ^: "'■■■·' ■

Slots 28, 29-, in the lower side'nwaiidteile of the ^;

Aufbrühzylinders 20 and in these slots 28i 29 once. ^"; Cross yorsprünge 2β ,. 27 on the housing 10 guide the lower end of the coffee-Aufbrühzylinder s ^ 20, - during this." Is moved. ; - ■,; _:: ;. . '. · ·. ^:: ''^■; . ■ ^v ; ""'■ ·

To move the brewing cylinder 20 ^? is an air cylinder Jl · located therein with piston 36 ^'of the above; -etoe - KQlTb.eH & tarjge ^ ^-30v.uhd. "^ inen- ⁱ t) ei; '32; Articulated with the ■ piston rod. connected transverse bolts ¹ 35 with the - ^; Poor .22 and, 24: .Eiwet BückHcslf exiei? '■ _ J &"' in the pressure cylinder Jl pushes ^: the piston j6 upwards' ^J:

in a Lages, in, soft 'dei' brewing cylinder 20 over the ^ri platform: 13 ^ raised ^ -and; is kept at a distance of dfer ^ filter helbe (see. Fig. 1 and 5). The distance ^^ wipe ^ the brewing cylinder 20 and the - .. PiIterseheib: e 14 in its rest position can optionally be changed by an adjusting

9098817115 0

nut 37 on the piston rod 30 is rotated.

Connected to the brewing cylinder 20 is a shutter 40 which can be raised and lowered under the action of a pneumatic cylinder 4L. The compressed air cylinder 4l can be designed in the same way as the compressed air cylinder 3I _0. On the closure 40 there is a sealing ring 42 attached to its outer edge which, when the closure 40 is lowered, rests against a sealing surface 43 which widens at the base of the stem 44 upper portion 45 of the brewing cylinder 20 is formed. A passage 60 for air leads through the closure 40 and is in communication with an air line 61.

On the lower wall part 51 of the housing 10 is a arranged double-acting compressed air cylinder 50, the over

a piston rod 52 with a wiper assembly in Verv binding, which consists of an elastic arm 54 and a wiper blade 53 attached to it. This wiper assembly can be moved over the filter disc 14 and removes the coffee grounds from the filter disk 14 and conveys them into a waste container, not shown below platform 13 »

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. '. "" .- "It should be noted that the piston in the air cylinder 41 has a smaller diameter than the closure 40 and the brewing cylinder 20 or that, with others In other words, the contact surface for the pressure on the piston is smaller is than at shutter 40. When pressure inside the brewing cylinder 20 is applied during a brewing cycle, it is therefore necessary to increase the pressure in the brewing cylinder to a value that is below the value specified in the servo ^ cylinder 4l of the prevailing pressure, including a printer

Lowering and control valve 6> in the / compressed air supply line is connected to line 61, which is the pressure of the compressed air

for example 5> 60 kp / cm to an amount of two

2
for example 0.35 kp / cm and which is insufficient to lift the closure 40 from the sealing surface 43.

3 shows that a chute 80 is suitably mounted to collect ground coffee from an electric coffee dispenser 81 and hot water from a W electrically controlled hot water valve 82 and direct these ingredients onto the inclined ring portion 46 of the brewing cylinder 20. The outlet end of the chute 80 is attached to the inclined ring portion 46 of the brewing cylinder 20 opposite so that a swirling movement and thus a thorough mixing of ground coffee and hot

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VJasser- occurs when- this: au.fr the ring part 46 ^ impinge ·, and of "-there-in AufbrülizyMnder reach .: This ./ _.: vorticity is -simultaneously to the Dieh /.. _{: tungjj-:...} ^ - _<45 area; ßauber keep sp: .that a good _.Abdichtung: ~ · scored 4.0; can be _{<v-by-.iden.VersQhluß....} ^ ·,. \ -, -..-'..-;">

.. DaiDit the different -: - Oeile. of the ICaf .fee automat en. ,, .. ... during every brewing cycle. in yorbestirnrater. Row egg. . work: is a. Program switch · 90 provided, which »· like, .. _: - shown in Eig .. '., L .. ·,:, die. Valves T2 to ^. and: -IQ0. , ^ controls - .which are in _v den-, compressed air supply lines, .which .. ■■ _-.-, from a pressure air tank.-7- _: Q in.-eLie; "SerVOZylinder ^ i ^. - AI · ».-. 5.0 and into the air outlet; 6.Q / .im- VeriSchluß. AQ . ...- The,. ■, · valves 72 to 75 in the servo cylinder feeds have vents 7.6 to 79, dur.eh. ^. di.e a. pressure relief -.:. the respective servo cylinder; according to the, control by, the program switch 90 can be performed. The _{; 4} , ... ^, - ..... valve 100, -which is in the -Zuleitxing to the _i Aufb.rühzylinde, i? .. 2.0, ■, has no ventilation, · -because the pressure in the cylinder 20 only_ at the end, each. ., weggenominenW ^ d _{Aufbrühzyklus,.,:..} _ ^ .if the shutter 40 is raised wird..Am, .Behälter.JObe- finds ,, a .EinlaBlei ung ^, Jl * .the _f to einen.nicht drawn, Verdiphter ange ^ sctilggseR can,,., ..,.

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The program of the program switch 90 is on "gebautV that first lowered 'the valve" J2 compressed air into the ZylinderVjI Ieitet t whereby' the "Aufbrülizylinder 20" to the platform "13 * we" d "(FTG." CT to 4) * that * in the second phase, the hot water valve 82 and the Kaff'eezuteiler 81 hot water and ground coffee brewing cylinder give ^*! 2Ό that ¹ 'in'den 73 compressed air in the third phase the valve! cylinder "in portions in the up kl ' conducts' whereby *' the closure 'Ho ' is sealingly led * (Pig *. ^) ₁ that 'in the fourth' phase the valve '00''compressedair' through the pressure valve 63, the line 61 leads the 'passage 60 into the brewing cylinder' 20, whereby the brewed coffee through the PiIter-. l4 disk in. the outlet line l6 is depressed, that 73, the cylinder 31 'and 4Γ drückentiasten und.däs close valve in the fifth phase, the valves 72 UNAE 100, "■ What the Äufbrühzylinäer 20 and the Verschluß'4o under the ^r EinflüB of the respective return springs in the associated servo cylinders 3Ϊ and ^ i can be raised, and that "in the sixth and last phase * the valves " Jb and 75 ^ lead one after the other 'Druökluft "into" the double-acting cylinder, whereby the ViischWbiatt 53 initially in the one '"and then in the other direction over the PiIterscheibe' and the used coffee grounds are removed from her. To the "-Wischeranordnuhg zu -." Lead and the necessary

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To be able to exert wiping pressure, guide

flanges J5i> and 56 (cf. in particular those Fig. 1 and 5) * which the top of the elastic. Influence the scraper arm 5 ^. . ·

From the description above it can be seen that that the brewing machine according to the invention works with an extremely short brewing cycle and that it is very simple constructed and therefore reliable in operation; he owns no complicated arrangements with cams, springs and gears, as in many known brewing machines are to be found

The arrangement shown in FIG. 6 shows essentially apart from the same structure as described above from the fact that the valve 100. with its compressed air line is omitted and the oil line with the compressed air passage 60 in the closure 40 to the same compressed air line is connected like the compressed air cylinder 4l, i.e. to the line controlled by the valve 73. That naturally means a simplification compared to the arrangement according to Fig. 1.,

So that the closure 40 is properly on the sealing surface 43 can be performed, is a pressure relief

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1332805

valve 201 of conventional design, etvia a spring-loaded one Washer, provided between the compressed air inlet in the compressed air cylinder 4l and the'Drucklufteinlafl 6l zu the closure passage 60 is arranged and only opens when the pressure in the compressed air cylinder Λΐ higher is than the pressure required to move the shutter is necessary if it has to be guided against the surface on the brewing cylinder 20 in a sealing manner. D'eser pressure can for example be in the range of about 1.75 kgf / cm

and 2.10 kgf / cm.

The pressure that the pressure relief valve 201 creates in the brewing cylinder 20 can under certain circumstances be so high that the flow rate of the brewed coffee through the filter disc Ik is so great that a good coffee aroma cannot be achieved. Therefore, a regulator 205 is connected between the pressure relief valve 201 and the closure passage 60. This regulator 205 can be a conventional pressure regulating device or a simple throttle which supplies a predetermined, constant passage cross section.

In another, shown in Fig. 7, modified Embodiment of the invention is the compressed air for the brewing cylinder 20 from the servo cylinder 4l

■■. ■■■■ ■ '. - 14 - ■ '■ "■;.-._ : y ::";' -:

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a- Axialbohrjng 3 ^ 1 'derived by, the

Piston 302 M-ndv-Uie KoIb enststig-e- jü * des; -: Servozy.lind ^: e "rö- Al Jirii the closure Λθ · 'leads-i, as long as -the valve · TJ-oiiien. And ■. = - -. -; the closure tightly'nd - ': anl: deii% Ä «i! ferüli2i-yliYitSör ■ SO, flows accordingly: .DruaklXift-in the cylinder'-2Q, -' V this .under * "-Press ^; £ e & et2t ~ \ un'dJiefc- brewed coffee: dumch--. '. ^v the filter disc. Xk printed Vfdi'd;.: ^S i; ^v ". w ·..; - - ' - ^ -.;: u ' ~

The Abtia! Borehole Jöl en, thäl ^j fc a narrowing (305) - '■■ ·' - (cf. the sub-drawing ζu --- Pig ', - ,. Τ-νϊη larger "MaÄst.§b) -. .This constriction reduces the flow of Drucli-lxlft, undi-hElt. ^ _: ". ..-. in this way the pressure in the brewing cylinder during the brewing cycle apart from the: erf order 1-iehßii -value of kelspieis-

wise 0,? 0 kp / em \ -that ^ dle..Vere _t n®un, g -505; not clogged. ri -. - .- ~ are ltarai, "are pilter elements _304, - * -_- and 3θβ -.- provided at both ends of them" It is sufficient, also, to close e.iri filter 306- ■ ■ · ■■; - "., -. use ,, .which that, penetration ^ - of ground coffee.; ■; , -; from the Auf-.brühaylinder 20 into-the constriction-.ujiterbindet ..,. _: · -: .. _·: The Filterelemenbe; 30 ^{^;.} and- J> OG köimeKüaus. any suitable, ·. .. Neten material ,: about / off - p, prp: _ser: SintepbriQnzei made - ■ "■ - be ϊ: _-:; ^ νί"; ^ '■ * ■ -: .--. ">^r; _: / * ·: - ^ v -.-- s-, ■■ '-, /'. · ■ - ".: ..-_- -. :.: * -.-

The facility according to Flg. 7 can according to that drawn in FIG. We ^ ise. modified -to apply ,. .-after which. ei, n Übex ^ drucliventirljOl «is provided, dcis - opens _Jr when the - pressure in · /, ·. Servozyliiider 4l least has reached the height. which he-. ■.

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1832801

Mti ■

Bas? # ΗΜΪ-'4öi ^: HegFind ^ r ^ feiäifc ^ nri ^ 3ΟΪ 'dir'Jtoifaien-'''" rod ' 3® $ uHd-etn ^ wiifriri ¥ öbie ^ diuekvehti'ii Mi''is'äh" ^f * · '^v; -die Böhinm ^^ löi m '^ imt itelll ^l '"gwis.ehefl.'äem ^ eii ■ and t§ffi Vfe ^ SöhiUfi 4ö ^; ^^ §cMögäin-ÜM ^: iiiiH sein _# dal der * Biuiök in de» Aufbrüheyiiadet “So hi-hey.

lii that dgt »* atifgetouiifci ^ if ^ o m

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Mril * iöhfeiöig fläefei figV

The 'Aufbrühäütoniafc nadh Pig. 9 has the same effect as the machine previously described and the arrangement for applying pressure to the brewing cylinder according to FIG. J is used. Instead of individual valves 72 to 75 and 100 (Fig. 1) In the various pressure air lines, however, a single rotary peeler 50 ^ is used in this embodiment according to FIG. 9, which is operated by a program switch 501 via a shaft 502 so that compressed air is released the container 70 in the respective pressure release cylinders 31, 41 and 50 in the correct order, uh dgfi each riöhtigefi ieitptffikfein urii 'mf the "Daüei *

the correct time periods are directed. Of the ...... Compressed air rotary valve 503 has a ventilation line 504, which the cylinders 31 * 4l and 50 to the correct one , Points in time, relieved of pressure. With the program switch 501 the motor;, 81- of the coffee dispenser and the hot water valve 82 are connected in the manner indicated.

The structural features of the compressed air slide valve 503 are not shown, because this slide valve can be used in generally known. Be constructed wisely. For example, the valve 503 can be equipped with a rotatable valve disk designated 505, which is pressed against a stationary valve seat by means of compressed air coming from the container 70. The channels not shown in the valve plate 505 and in the fixed valve seat can be arranged so that the cylinder _; 31 »4l and 50 must be connected to the container JO in the correct order when the plate 505 is rotated.

Of course, a pneumatic rotary valve like him can is shown in Fig. 9 with an arrangement according to Fig. 7, can also be used in the other exemplary embodiments shown in FIGS. 1 to 5, β and 8.

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Claims (1)

Claims ilj Pressure fluid controlled coffee machine, characterized by the combination of the following features; a) A base plate (13) with an outlet (15, 16) for the brewed coffee lying filter disc (11 ») and with a sealing ring body (17) surrounding this filter disc (14) and with an upright, brewing cylinder (20) open on both sides, which is arranged above the base plate and in its rest position with its lower edge a little above the Base plate aDSChiisses, in the brewing position, however, with its lower edge sealing against the The sealing ring (IT) is pressed, b) an actuator assigned to the brewing cylinder (20), c) a closure (40) for the upper opening of the Brewing cylinder (20), ' d) another one associated with this closure (40) Actuator, - 18 .- · '. ■■
90a881 / tl50 '- ■ "■'" ■■. " _T% ." . 193 / SO-S e) Auxiliary equipment i8l> ,, JB2) Xfir, 4as. ^ Watching measured amounts of ground coffee and hot water in the brewing cylinder (20), f} one with the Auf brühzy! .inder. ^ OX ^ usaj ^ n pressure-exerting device, , · <g>, iäi ^ f sein ^ ichtüngeii ..J (S ^ % K% fikr das, leading away the .... from the -piitersch ^ ib ^ ^ (4th ^), and _v . m. in . Temporal Jlufein ^ npl successes in each case .suei'S.t .di ^ e, attachment .des, ei? atgetiannten, Stellglit-de,! veipänlat that the Aufb.rüii2iyiinder, (20) into die.Mifbrühstell .bt _^:, then, ^ etiit.igung ;. the. Auxiliary ^ inriöhtungön {Il 62) for the allocation of coffee .ynd Waiter, äüslöltj then the actuation of the second Sfcell - ^ lie / des .für das.Äufsetztn. deg ^ yefaehlusgfs, (kU) üttd; thereby sealing the upper öf inüftg of AufbfÜh * cylinder (20) causes _$ then-the Bitätigting the \ druckäusübenden means finleitit ^ in the Äufbrühzylinder (M) leiteni in the operation AFL-ehiüß both actuators ve ^ änlält "felihe 'on the one hand the brewing cylinder (IQ) in the | Uhe; läjg # ΐ / f 1S Ö " 1932305 bring and on the other hand the sealing closure (Mo from the upper opening of the brewing cylinder (20) lead back and finally the actuation of the auxiliary device (53, 5 ¹ J) for the removal of the coffee grounds
causes. 2 »Coffee machine according to claim 1, characterized in that the pressure-exerting device is a compressed air source (70)
and compressed air guiding elements including a passage (60) through the closure ( ¹ JO), the compressed air from
lead this source of compressed air into the brewing cylinder (20). 3. Coffee machine according to claim 2, characterized in that the second-mentioned actuator is connected to the compressed air source
connected 'air cylinder C ^ l) and that the.
Compressed air elements a pressure reducing device
included, which the pressure in the Äufbrünylinder (2Q) on
one below the one prevailing in your compressed air cylinder ('Jl)
The pressure it holds. - H, Coffee machine according to claim 3, characterized in that the pressure reducing device, the Porin a \ ⁷ erengung (305)
of the passage (60). 5. Coffee machine according to Claim.-if-, characterized * 0S861 / 1TSO 'VA, that in the passage "at least one porous piLter (306) is provided _: the one in flow-riptifcung below the mentioned constriction (3Q5) ^: angeord.ne | iat. 6, coffee machine nqch. 5, d§tdur <? H gekepn- draws, that the |> QP: loop | p | filter made of sintered bronze.;, ?. Coffee machine nacli e.i p or S ₃ characterized; _% .tifß S; ieh; ip de ^^ linder IkI) a with the gen / apntep ffr: 5chlu; § (4Q) a piston rod (303) verb.updjfper iiO; lfeer \ (3Q2J that the compressed air leading ^ i.em # n | # _v a _f , 4, 5 Piston (302) and the piston rings with this passage (6Q> vet q | ei axial po traveling .the is itpö ei ^ e fiTil f 3; fe | § ^ 3 to; ■>> 10 * Coffee machine according to one of claims 2 to 9, characterized in that the auxiliary direction to remove the coffee is a ^{isher "(53j 5 ^) that can be moved over the filter disc (I 5} O /) and a double pressure-release cylinder ( 50) "for actuating the washing device and that the 'double L tv / irkende compressed air sy linder (50) is connected to the DrucklüftqueHe (70). 11, coffee machine according to claims "2, 3» 9 and Ip ^ characterized in that the compressed air-carrying elements. ^ The compressed air cylinder (31) of one actuator, the pressure release cylinder (Hl) of the other actuator and tfer double-acting compressed air cylinder (50) are connected to the - ■ compressed air source (70) via a valve control controlled by a program switch (90) » 12 »Coffee machine according to ^ nafp3? Iicii 1 |» äadurcfe the Vantiletauerung aia eiEt jp is up * ^ aS a EinFichfeun ^ for tfse p relative; on flat upper. Äbaahnifct (^ 5) <| e§ 4 «eJF- ^ (2Ö) aa is stated that dia Ziitafcem; aitf .: "el las to Rüigt & il (46) *. ■ ^ ';,;" .._. > BATHROOM RIGINAL Ik. Coffee machine according to one of the preceding claims, characterized in that the outlet for the brewed coffee is funnel-shaped and has a wide opening directly below the filter disc (1 ^), and that the outlet part (15, 16) has a significantly smaller cross-section than the upper wide opening * 903881/11 SO Lee rs ei ie