SINGLE HEAD JUICE EXTRACTOR

Abstract: A juice extractor uses two commonly driven crank arm (52, 70) drive systems to provide a low profile juice extractor (10) having upper and lower fruit cups (16, 18), a juice collecting sump (20), a strainer tube (22) and an orifice tube (24). A conventional tubular knife (26) and a receiver (28) for the knife (26) are also provided.

Description: The present invention relates to a juice extractor having interdigitating upper and lower cups for extracting juice from one fruit per machine cycle, one machine cycle defined by the upper cup starting from and returning to a top dead center, a strainer tube positioned below said lower fruit cup, an orifice tube supported for reciprocal movement by means of orifice tube drive linkage by means of orifice tube drive linkage through said strainer tube. The extraction of juice from citrus fruits such as oranges has been accomplished successfully for a number of years using well known interdigitating cups and orifice tube juice extractors. Such extractors are made by the FMC Coporation and have been disclosed in several publications. Improvements to the basic two cup interdigitating extractors continue to be made however. A juice extractor according to US-A-4,300,449 comprises a pair of opposed cups in order to force the contents of the fruit as squeezed into a strainer tube. An orifice tube can be driven upwardly within the strainer tube to force juice and some solid material through the perforation in the strainer tube. A dual chamber connected to the strainer tube manifold enables two juice grades to be separately extracted from each fruit. From this reference it is not known how to actuate exactly the upper cups and the orifice tube. A further apparatus for extracting juice and peel oil from citrus fruits is disclosed in GB-A-753,988. A cross head carrying upper cup can be moved downwardly by means of follower rollers and cam discs which are connected to a shaft. This shaft is driven by an electric motor through a chain and sprocket drive. A crossbeam holding orifice tubes which extend into finisher tubes is reciprocated by rods which are connected at their lower ends for conjoint movement by a transverse bar. Thus the orifice tubes can be moved in timed relation with the upper cups since they are each controlled by cams keyed on the same shaft. A citrus fruit juice extractor according to US-A-3,236,175 comprises a pair of cups the upper one being secured to a vertically reciprocable head whereas the lower cup is rigidly supported on a stationary bedplate. A strainer tube forming a part of a juice separating apparatus slidably receives a pressure exerting member in the form of an orifice tube which is fastened to a crosshead. The crosshead is operatively connected with the upper cup suppporting head for vertical reciprocation in timed relation therewith in a manner not shown in this reference. US-A-4,700,620 discloses another citrus fruit extractor including an upper cup reciprocably movable towards a lower cup by means of a shaft and cam mechanism. An orifice tube which is slidably fitted within a strainer tube has its lower end corrected to a guide rod which in turn extends through a beam which is reciprocated by rods actuated by a cam to raise and lower the beam in synchronism with the cup operation. A cup shaped magnet is provided to reasably retain the orifice tube in its upper travel limit. During the course of compressing a fruit between the cups the liquid pressure is sufficient to overcome the latching force of the magnet causing the orifice tube to drop against an elastomeric member which cushions the gravity force of the descending orifice tube. US-A-2,649,730 discloses an apparatus for extracting juice from citrus fruits in accordance with the prior art portion of claim 1 for the purpose t eliminate the fruit carcass ejecting operation which formerly took place between successive juice extracting operations. The cycle of operation is controlled by means of cams cooperating with cam followers. With each revolution of a shaft to which the cams are fixed the latter act on a cross-head which is recoprocated downwardly and upwardly together with upper cups. Plungers each having an annular cutting edge at their upper ends extend upwardly into finisher tubes with a close sliding fit therewith. These plungers are vertically moveable by means of arms which are pivotally connected to links the upper ends thereof being pivoted to a further cross beam. The prior art two cup interdigitating juice extractors are large machines that have been designed for high volume production situations. Numbers of these large, high volume juice extractors would be ganged together in the juice room of a juice producer to take advantage of the economics of scale of shipping fruit to a central location, storage and processing of large quantities of fruit juice and packing and shipping of the juice. One object of this invention is to provide juice extracting equipment that has high yield capacity and better juice quality than existing juice extractors for point of sale installations such as fruistands, supermarkets and in mobil equipment. The invention set forth herein is an improved two cup interdigitating fruit juice extractor that is designed to have a lower height or profile as compared to currently available two cup interdigitating juice extractors due to a unique drive system comprising drive means for moving said orifice tube through the strainer tube twice per machine cycle. This compact design is directly due to the cantilevered arms of the unit being driven by the unit's crank arm drive assembly. This invention is not necessarily directed at providing equipment for a large juice extractor plant, but, as stated earlier is designed for the high yield production of juice and high quality juice at relatively low volumes for point of sale installations. Other point of sale or portable juice extractors exist, however, none incorporating the two cup interdigitating fruit cups and the orifice tube apparatus with the drive disclosed herein are known to the applicant. Typically point of sale juice extractors are not as selectice in juice extractors--that is, extracting juice having low oil content and low incidences of seeds and pulp--as the instant invention. By providing a cantilevered drive system a very sophisticated juice extractor can be packaged in a fraction of the space taken up by a conventional two cup extractor as the vertical drive mechanism of the conventional, well known ectractor is not used. The manner in which these and other features of the present invention can be obtained in practice will be apparent from the following detailed description of a preferred embodiment of the invention. Figure 1 is a partially fragmented and sectioned front elevation view (with drive elements left off for clarity) of the fruit juice extracting apparatus. Figure 2 is a partially fragmented and sectioned side elevation view of the fruit juice extrator including portions of the drive mechanism. Figure 3 is a partially fragmented rear elevation view of the significant portions, for purposes of this specification, of the fruit juice extractor of Figure 1. Figures 4A-E are schematic presentations of relative positions of the fruit juice extractor elements as they are driven through a typical extraction cycle. The general arrangement of the juice extractor can best be understood by a review of the Figure 1 presentation. In the Figure the juice extractor, generally 10 is provided with a housing 12 supported on a base 14, which houses and supports the extractor apparatus. For the most part, the actual extractor apparatus includes well known components including an upper cup 16, a lower cup 18, a juice collecting sump 20, a strainer tube 22 and an orifice tube 24. A conventional tubular knife 26 and a receiver for the knife 28 are also provided. The upper cup and the lower cup are each formed of intersticial or interdigitating fingers that fit between adjacent fingers of the other cup when the cups are urged together to squeeze the juice out of the fruit. In the preferred embodiment presented herein, the lower cup 18 is fixedly mounted to the base 14 and housing 12 through the use of a mounting plate 40 which is fastened to an internal wall 41 of the juice extractor. The juice sump 20 and its contained strainer tube 22 are attached to the mounting plate 40. The internal wall 41 is fastened to the frame or housing 12 of the juice extractor. The juice extraction process, in a simple example, proceeds as follows. The strainer tube 22 hosting the tubular knife 26 will be forced into the peel of the fruit to sever the peel. The contents of the peel--that is, the fruit--will be forced into the strainer tube 22 as the upper cup 16 is urged into the lower cup 18. The fruit is substantially all contained in the strainer tube 22 while the peel of the fruit is extruded between the fingers of the cups for ultimate collection and appropriate disposal. The fruit now contained in the strainer tube 22 is compressed upwardly by the orifice tube 24 causing the fruit juice to be extracted from or squeezed from the entrapped fruit in the strainer tube 22 and drained through small diameter orifices in the strainer tube into the juice collecting sump 20. Multiple strokes per machine cycle of the fruit in the strainer tube 22 by the orifice tube 24 are contemplated by this invention. From the juice collecting sump 20, the juice is drained to a collection receptical. Figure 1 shows components that are unique to the presented preferred embodiment including a feed chute generally 30, an upper cup reciprocating support structure 32, a fruit lift 34 that is attached to and reciprocates with the upper cup reciprocating support structure 32, and a fruit bridge 36. The orifice tube 24 is mounted for reciprocal movement on an orifice tube reciprocating support structure 38. Figures 2 and 3, wherein like reference characters as recited in Figure 1 refer to the same parts, are views of the juice extractor that illustrate the invention being presented. These Figures show the drive motor 42, which in a preferred embodiment could be a gear motor; driven sprockets; an upper cup reciprocating support structure driven sprocket 44 or upper cup sprocket; and an orifice tube reciprocating support structure drive sprocket 46 or orifice tube sprocket. The orifice tube sprocket 46 turns a shaft 48, supported in a bearing block means 50, which has a crank arm 52 fixedly mounted to the shaft 48. Attached to the outboard end of the crank arm 52 is a rod 54 that connects the crank arm 52 to the orifice tube reciprocating support structure 38. The orifice tube reciprocating support structure 38 is guided for reciprocal movement through the use of a pair of bearing columns, one shown as 56 which passes through bushed bearing passages such as 58 in the orifice tube reciprocating support structure 38. The orifice tube reciprocating support structure 38 extends through an aperture 43 in the internal wall 41. It is apparent that as the motor drives the orifice tube sprocket 46 through the expedient of the chain 60, the orifice tube 24 will be moved vertically upwardly and downwardly by the linkage just described. Although a chain and sprocket assembly is shown, it is also contemplated that a gear train drive means or a belt drive means between the motor and the two driven linkages, that is, the orifice tube drive linkage and the upper cup drive linkage (described ahead), could be used with equal facility. The "action" of the upper cup is controlled and driven by the upper cup sprocket 44 which is also driven, and is simultaneously driven by endless chain 60 through the motor 42. The upper cup sprocket 44 is journalled on a shaft 62 which is supported by a mounting block 64 which is supported by supports 66 and 68 mounted to the housing 12 of the juice extractor. The shaft 62 is fastened at its other end to an upper cup drive crank arm 70. An upper cup drive rod 72 connects the upper cup drive crank arm 70 to the upper cup reciprocating support structure 32 to which the upper cup 16 is attached. The upper cup reciprocating support structure 32 is guided by bearing columns to 74 and 76 which pass through bushed bearing apertures 78 and 80 in the upper cup reciprocating support structure 32. A portion of the reciprocating support structure, that portion to which the upper cup is attached, passes through aperture 82 in the internal wall 41. The upper cup sprocket 44, in a preferred embodiment, is twice the diameter of the orifice tube sprocket 46, having 48 teeth and 24 teeth respectively. The gear motor 42 has an output of 100 RPM with a 14 tooth drive sprocket. The gear motor is a one and a half horse power motor in this preferred embodiment configuration. Other gear ratios are possible. Since the ratio of the upper cup sprocket 44 to the orifice tube sprocket 46 is 1:2 the orifice tube sprocket will rotate twice for each machine cycle. In prior art large capacity juice extractors, the orifice tube 24 would only be driven through the strainer tube 22 once per cycle but with the 1:2 ratio of the instant invention, the orifice tube 24 will be cycled to actually squeeze the fruit in the strainer tube 22 at a speed to simulate a cam motion used in commercial extractors to obtain the same juice yield as a commercial extractor. One machine cycle of juice extraction from a single fruit is shown somewhat pictorially in Figures 4A-4E. In these figures, the fruit, for instance an orange 84, has been served to the juice extractor by the feed chute gener ally 30. The orange to be squeezed is held on the fruit chute of the fruit lift 34, which, as shown in Figure 1 is attached to the upper cup reciprocating support structure 32 so that it moves with the upper cup reciprocating support structure 32. As the upper cup reciprocating support structure 32 is lifted by the linkage and rotated to top dead center by the upper cup reciprocating support structure driven sprocket 44 the fruit lift 34 will lift the orange to the top of the fruit bridge 36 and allow the orange to roll across the fruit bridge 36 to nest in the lower cup 18. It should be noted that the fruit bridge has a barrier wall portion that blocks the fruit from leaving the fruit lift 34 until the fruit reaches the fruit bridge transverse surface. Figure 4B shows the upper cup sprocket 44 at top dead center and this could be considered the start of a complete cycle. At this point there is an orange resting in the lower cup 18, the fruit lift 34 has a fruit lift wall blocking the next orange from leaving the feed chute 30, the orifice tube 24 is at an up position with its orifice tube sprockets 46 at 0 into its first of two rotations per each machine cycle. In Figure 4C the upper cup sprocket 44 has advanced 90° in its cycle and the orifice tube sprocket 46 has advanced to 180° in its cycle as it is driven at twice the rotational speed of the upper cup sprocket 44. Functionally the orifice tube 24 has not advanced into a squeezing position at this stage of the machine cycle. The upper cup 16 however has closed in toward the lower cup 18 and the orange is about to be squeezed in a well known manner. In Figure 4D the sqeezing has been started, the upper cup sprocket 44 has advanced another 45° and the orifice tube sprocket 46 has advanced another 90°. The upper cup sprocket 44 still has 45° of motion left to complete the compression of the fruit before the upper cup 16 starts away from the lower cup 18. The orifice tube 24 has partially squeezed the juice out of the fruit. As the cycle continues the orifice tube 24 will be moving to the top of the strainer tube 22 as the orange is forced into the strainer tube 22. When the upper cup sprocket 44 is at bottom dead center (180°) as shown in Figure 4A the orange will be completely compressed and the orifice tube 24 will be at the top of its stroke. The timing between the upper cup sprocket 44 and the orifice tube sprocket 46 in a preferred embodiment is as shown in Figure 4 however, the crank arms 52 and 70 could be rotated around their respective shafts to adjust the timing of the relationship between the squeezing of the fruit and the orifice tube compression cycle. Another embodiment is contemplated wherein the orifice tube 24 could be driven through the strainer tube 22 more than twice per machine cycle. By using the crank arm drive for the orifice tube drive the costly cam actuated orifice tube drive system familiar in the heretofore well known juice extractors have been eliminated. This benefit results in a cost efficient juice extractor that has a low profile and is superior to other extractors for use in point of sale applications.

Claims: 1. A juice extractor having interdigitating upper (16) and lower (18) fruit cups for extracting juice from one fruit per machine cycle, one machine cycle defined by the upper cup (16) starting from and returning to a top dead center, a strainer tube (22) positioned below said lower fruit cup (18), an orifice tube (24) supported for reciprocal movement by means of orifice tube linkage through said strainer tube (22), characterised by drive means (42, 46, 48, 52, 54, 60) for moving said orifice tube (24) through said strainer tube (22) at least twice per machine cycle. 2. A juice extractor in accordance with claim 1 wherein said drive means includes: an upper cup (16) reciprocating support structure (32) drive means (42, 60, 62, 44, 70, 72), an orifice tube (24) support structure (38) drive means (42, 60, 46, 48, 52, 54) geared to said upper cup (16) reciprocating support structure (32) drive means (42, 60, 62, 44, 70, 72) in a ratio of 1:2 whereby said orifice tube support structure drive means drives said orifice tube (24) through said orifice tube drive linkage (52, 54) into said strainer tube (22) twice for every rotation of said upper cup reciprocating support structure drive means. 3. A juice extractor in accordance with claim 2 wherein said drive means includes a drive motor (42) having a drive sprocket, said upper cup (16) reciprocating support structure (32) drive means is a sprocket (44), said orifice tube (24) support structure drive means is a sprocket (46), and said upper cup reciprocating support structure drive sprocket (44), and said orifice tube support structure drive sprocket (46) are drivably connected to each other by an endless drive chain (60). 4. A juice extractor in accordance with claim 3, wherein said upper cup reciprocating support structure drive means (44, 62) is connected by a linkage consisting of a crank arm (70) and a rod (72) to the upper cup reciprocating support structure (32). 5. A juice extractor in accordance with claim 4 wherein said upper cup reciprocating support structure (32) is attached to, for movement therewith, a fruit lift (34) for vertically transporting fruit (84) from a source (30) of fruit to a fruit lift discharge point. 6. A juice extractor in accordance with claim 5, wherein said fruit lift (34) includes a barrier wall moving reciprocally with said upper cup reciprocating support structure (32). 7. A juice extractor in accordance with claim 6 wherein a fruit bridge (36) is fixedly mounted to said juice extractor proximate to said fruit lift (34), said fruit bridge (36) including a barrier preventing fruit being vertically transported on said fruit lift (34) from being prematurely discharged from said fruit lift (34).

Inventors: ANDERSON, DAVID N., SEGREDO, GUILLERMO T.
Applicants: FMC CORPORATION
Application year: 1989
Main classification: A23N1
IPC codes: A23N1, B30B9