JPH034190B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a juice extraction machine for citrus fruits,
More particularly, it relates to an improved citrus juice extruder of the type that includes opposing cups adapted to compress citrus fruit placed between the cups.

In a citrus fruit juice pressing machine of the type described in U.S. Pat. No. 2,780,988, each fruit is placed in the lower member of a two member pressure cup. When the upper cup member is brought downwardly to close the cup and reduce its interior space, the fruit cracks and is subjected to a squeezing force, thereby causing some portions of the skin and the fruit to become porous. It is pushed downward toward the perforated filtration tube. While the fruit part is in the filtration tube, an orifice tube telescopically disposed at the lower end of the filtration tube moves upwardly within the filtration tube. As material rapidly accumulates at the upper end of the orifice tube, its upward movement exerts pressure on the material within the filtration tube, squeezing the juice out of it and expelling it laterally through the holes in the filtration tube.
The lower end of the orifice tube includes an opening or orifice through which material collected in the orifice tube is occasionally discharged. The pressure developed by the orifice tube and the resulting percentage of liquid expressed from the material within the filtration tube is a function of the mass flow rate of the material and the size of the orifice. In order to compensate for seasonal and quality changes in the fruit and also for variations between different varieties, suitable orifices must be selected and set for optimum yield. During the conversion, the machine must be stopped and the process is therefore costly both in terms of labor time and lost productivity. Therefore, even though the yield is improved, the result is at best a compromise due to the limited number of orifice sizes.

When the machine is shut down at the end of the working period, a slug of core material remains inside each orifice tube. Although automatic flushing devices are effective for most of the waste-accumulating parts of machines, such devices are not suitable for removing core material slugs from orifice pipes because normal flushing operations cannot reach this area. . Each slug must be manually removed from the orifice tube before it becomes organically bad. Such cleaning procedures are also labor intensive and therefore costly.

An improvement to the above structure is U.S. Patent No. 3,429,257.
It is shown in the specification of No. In the citrus juice extractor shown here, the orifice tube has an opening at its lower end, which is normally closed with a pivotable gate. The gate is held in its closed position by a pneumatic piston and a cylinder arrangement controlled by a preselected pressure so that the selected pressure is maintained at the material in the filter tube. The preselected maximum pressure can be easily adjusted, allowing different types of fruit to be processed most effectively.

The present invention provides a device that allows control of the pressure in the orifice tube while the machine is in operation, and automatically maintains the pressure by changing the size of the orifice in the tube. The apparatus of the present invention also includes a washing system which allows the use of caustic solution under pressure and hot water to expel the pulp slug from the orifice tube.

The apparatus of the present invention includes means for applying a predetermined upward pressure to the residue in the orifice tube, thereby maintaining a desired pressure on the material from which liquid is forced. Means is also provided for selectively directing the cleaning fluid upwardly through the orifice tube to eject debris from the tube.

According to the invention, a juice extractor for citrus fruits includes at least a pair of cups, each of which is formed with a number of circumferentially spaced fingers, one cup discharging the juice-containing contents of the fruit. It has a small passageway. One cup of each pair of cups moves to the opposite cup, so that the fingers interdigitate each other, gradually closing the space between the cups and placing the fruit therein, thereby discharging the juice. The contents contained in the fruit are squeezed through the skin of the fruit and into the discharge passage. The filtration tube is connected to the outlet passage, and an orifice tube is reciprocated within the filtration tube.
A tank for collecting the youth is located around the perforated portion of the filter tube to collect the compressed youth through the holes in the filter tube. Each orifice tube is driven into a temporally coincident relationship with an associated movable cup.
Thus, when the movable cup is driven into interdigital engagement with the fixed cup, the orifice tube is driven into the filtration tube, thereby reducing the effective volume of the filtration tube and removing the youth from the youth-containing material into the pores of the filtration tube. is pushed through to the accumulation tank.

According to an important feature of the invention, the extractor further includes a flow restriction device to restrict the flow of remaining citrus material through the orifice tube. The flow restrictor includes a plunger reciprocably housed within the orifice tube and having a control surface at its inner end. The plunger is adapted to restrict flow through a discharge opening formed in the wall of the orifice near the end of the orifice tube distal to the connected extraction cup. The flow restriction device further includes a fluid pressure cylinder that biases the plunger inwardly at a preselected pressure, thereby controlling flow through the discharge opening and thus setting the final pressure within the filtration tube.

In a preferred embodiment of the citrus juice extractor, the fluid pressure controlled orifice tube flow restriction device includes a device for cleaning residual citrus material from the orifice tube. The cleaning device includes a passageway formed longitudinally across the plunger. A check control valve is provided in the passageway to allow cleaning fluid to enter the orifice tube at a moderately high pressure. The pressure required for the check control valve to open is normal compressed fluid (air).
is sufficiently high to prevent flow into the orifice tube at the relatively low pressure selected to operate the orifice control device during normal extraction operations.

Preferred embodiments of the invention will now be described with reference to the accompanying drawings.

The overall structure of the juice extractor 10 for citrus fruits of the present invention will be explained with particular reference to FIGS. 1 and 3. The extractor includes an upper cup assembly 12 and a lower cup assembly 14, with a fruit F placed between the cups.
(Figure 1), thereby compressing the dieuse and the inner dieuse-containing material (not shown) within the skin of the fruit.
is pumped into a filtration tube 30 that communicates with the lower cup assembly 14. Lower cup assembly 14 is bolted to floorboard 15 and upper cup assembly 12 is secured to the lower end of vertical drive rod 16. The lower cup includes a number of circumferentially spaced upright fingers 18, and the upper cup assembly includes a cup formed of a number of similarly circumferentially spaced fingers 20 (FIG. 1 only). Contains. The fingers of the opposing cups are arranged in a circumferentially offset mutually pointed relationship, so that when the cups are stacked against each other, the upper fingers are received between the lower fingers and A generally spherical cavity or pocket is formed therebetween. This pocket then becomes progressively smaller in size as the two cup assemblies are moved relative to each other, as will be explained later.

For cutting a small cut from the peel of a citrus fruit F at its lowest part, the lower cup 14 is an annular cutting having a centrally formed discharge passage therein and an annular blade 26 disposed within this discharge passage. It has a knife 24. The upper end of the filter tube 30 is engaged within the lower end of the annular knife. The orifice tube 32 is inserted into the filtration tube, with its lower end 32a connected to the lower end 30a of the filtration tube.
It is installed so that it can freely reciprocate by leaving it on the outside of the body. The upper end 32c of the orifice tube is inclined inward (Fig. 1),
A sharp cutting edge facilitates the flow of the remaining citrus material R into the hole of the orifice tube. Instead of being integrally formed with the orifice tube, the annular cutting edge can also be formed as a split ring removably connected to the upper end of the orifice tube. Such a split ring is described in US Pat. No. 2,856,846. The lower end 32a of the orifice tube is the upper housing portion 7 of the pneumatic orifice restriction device 33 of the present invention.
It is attached to 6. Orifice restriction body 33 further includes a lower housing or base portion 74, which further includes orifice tube drive cylinder 40 (third
(Figure). The drive cylinder 40 drives the associated orifice tube upwardly in synchronous relation with the downward movement of the associated upper cup assembly 12 so that the juice-containing material within the citrus fruit is first compressed by the compressive force exerted by the cup assembly onto the skin of the fruit. Filter tube 30
It becomes possible to be pushed into. Details of the synchronous drive will be explained later. Use the filtration tube (first
The juice that is expressed and filtered from the juice-containing filling material of the fruit through the hole 30b (FIG.) is collected in a laterally extending tank 36 of the extractor. The juice is then pumped from the tank through conduit 37 for further processing.

Upper cup drive shaft 16 and orifice tube 3
The second drive system is described in detail in US Pat. No. 4,309,943. This US patent specification is incorporated herein by reference. Generally, several upper cup assemblies 12 (only one shown) are driven in succession in a selected time relationship;
A connected orifice tube 32 is driven in synchronous relationship with the upper cup. Mutual time synchronization of the drive of the orifice tube combined with the upper cup is such that first all the inner juice-containing material is transferred from the skin Pa of the fruit F to the filter tube 3.
0 (FIG. 3), and then the orifice tube is driven downwards towards the extraction cup and the juice is squeezed out of the material forced into the filter tube through the hole 30b in the filter tube. The drive shaft 16 for each upper cup assembly is driven downwardly by a lever arm 34 which is cam driven by a pivot cam 35 mounted on the shaft 36. The camshaft 36 is connected to a motor 37 via a belt drive (not shown).
Driven by After extracting juice from the fruit, the upper cup assembly is raised by air cylinder 38. The air cylinder piston is directly connected to the upper cup drive shaft 16. Orifice tube 32 is actuated by a hydraulic cylinder 40, which in turn is actuated by a master cylinder 42 located adjacent to the air cylinder. The master cylinder is driven synchronously with the upper cup assembly 12 connected by a lever arm 44 connected to the piston of the master cylinder and a cam 45 mounted on the camshaft 36, so that the lever arm 44 is connected to the upper cup assembly drive arm 34. and the desired phase relationship. The orifice tube is returned to its original retracted position by an air cylinder (not shown) incorporated in slave cylinder 40. Details of the hydraulic drive device are described in the aforementioned US Pat. No. 4,309,943, as mentioned above.

The pneumatic orifice restriction device 33 of the present invention controls the flow of remaining citrus material through the orifice tube 32 to establish an optimal level of final pressure when juice is expressed from the filter tube 30. There is. The orifice restriction device constitutes a separate carrier housing for the orifice tube so that each drive cylinder 40 in the row of commonly driven opposed brewing assemblies (see U.S. Pat.
4309943) are operated continuously.

As shown in FIGS. 1 and 2, the pneumatic orifice restriction device 33 has a plunger 64 reciprocably housed in the hole 32b of the orifice pipe with low friction fitting.
including. The orifice tube has a threaded lower end portion 32e secured to the upper housing portion 76 of the restriction device.
has. A discharge opening 32d is formed in the wall of the orifice tube adjacent the housing portion 76 of the restriction device. The upper end of the plunger 64 is cut off,
A flat control surface 64a is formed extending from the axis of the orifice tube 32 at a 45 degree angle. A plunger is mounted within the restrictor housing portion 76 so that the control surface 64a faces toward the discharge opening 32d, thereby directing the remaining citrus material R to the discharge opening when the plunger is lowered to permit flow. deflects laterally through 32d.

As shown in FIG. 1, the outlet 32d of the orifice tube 32 is contoured to cooperate with a flat sloped control surface 64a of the plunger 64 of the orifice restriction device so that the pressure applied to the material within the orifice tube 32 gradually increases. As R descends, increasing amounts of the remaining citrus material R are allowed to flow through the outlet. In particular, the outlet 32d is U-shaped with its upper edge portion located in a plane perpendicular to the orifice tube and at an angle of 45 degrees, i.e. parallel to the control surface 64a, in a plane intersecting the axis of the orifice tube. A profile formed by a lower edge portion (only half shown in Figure 1) and a pair of interlocking intermediate edge portions extending between the ends of the upper and lower edge portions in a plane extending through the centerline of the orifice tube. has. When plunger 64 is fully lowered, control surface 64a aligns with the sloped lower edge portion of the outlet, allowing remaining citrus material to flow out of the unrestricted outlet onto the frustoconical upper surface of housing portion 76. As the plunger rises from this fully lowered position due to a decrease in final pressure, the actual size of the outlet open to flow decreases linearly with the height of the plunger. After the control surface 64a rises to the point where it intersects the upper edge portion of the outlet, the size of the restricting outlet decreases more rapidly with increasing plunger height to the normal position shown in FIGS. 1 and 2. reaches the fully occluded position. The control surface and outlet configurations and initial (occluded) relationship of the plunger and orifice tube described herein cause the plunger to rapidly open the outlet passageway when the desired final pressure is exceeded. After opening, the control surface-outlet configuration allows the pneumatic restriction device 33 to accommodate variations in the density of different juiced fruits, resulting from, for example, differences in fruit seed volume.

The pneumatic orifice restriction device 33 is a plunger 64
includes a chamber 66 (FIG. 2) communicating with an enlarged lower end 64b of the. A septum 68 is clamped between the upper portion 76 and the lower portion 74 of the restriction device housing.
The diaphragm is attached to the lower end 64 of the plunger in a manner to be described later.
It is fixed to b. Air under controlled pressure is provided through the introduction passage 66a in the base portion 74 of the housing to bias the plunger upwardly. As shown in FIG. 1, air is supplied through an inlet tube 67. The inlet pipe is connected to the outlet 100a of the shuttle valve 100, and is connected to the inlet 10 of the shuttle valve.
0b is connected to conduit 69. Conduit 69 is connected to an air line 70, which is connected to a suitable compressor (not shown). Control valve 72
A meter or gauge 73 is installed in conduit 69. Regulating valve 72 controls the air pressure within chamber 66, thereby exerting a constant upward bias on limiter plunger 64. Thus, at the orifice tube 32 containing the remaining citrus residue R, a constant preselected final pressure is applied to the juice-containing material in the filter tube 30, and only when this pressure is exceeded is air flow through the outlet. Outflow is possible.

In FIGS. 2 and 3, the base portion 74 of the restrictor housing is attached to the citrus juice extraction machine 1.
It is pivotally connected to the piston of the drive cylinder 40 of No. 0. Upper housing portion 76 is secured to base portion 74 by bolts 78 (FIG. 2). A diaphragm 68 is secured in a fluid-tight relationship between the upper and lower housing portions. A bleeder port 76a (FIG. 2) is formed radially in the upper housing portion to connect the cavity above the diaphragm to the atmosphere and improve the sensitivity of the restriction device. The upper housing portion has an axial bore 80 through which the plunger 64 passes.
Hole 80 has a slightly smaller inner portion 80a for guiding plunger 64, a counterbore portion 80b above it for accommodating O-ring 82, and a counterbore portion 80b above it for accommodating O-ring 82, and an outer end thereof for accommodating threaded lower end 32e of orifice tube 32. It has a screw hole portion 80c.

As previously pointed out and as shown in FIG.
It has a larger diameter than the portion extending through the hole 32b of the orifice tube 32. The diaphragm 68 is attached to the lower surface of the relatively large diameter enlarged lower end 64b. This part will hereinafter be referred to as the piston part of the plunger. A retaining ring 86 is secured to piston portion 64b by bolts 88 and attaches the diaphragm thereto. This anchoring ensures that the plunger does not rotate within the orifice tube, so that the plunger control surface 64a remains in the correct orientation relative to the outlet 32d, and that the attachment does not affect the low friction operation of the plunger. An annular cushion 90 of elastomeric material is housed on top of the piston portion of the plunger. The stopper 92 is the base portion 74
It projects upwardly into the chamber 66 and acts as a bumper below the piston section. Thus, the piston part 64b of the plunger is connected to the upper housing part 7.
6 and a stopper 92 on the opposite side. As shown in FIG. 2, when the piston portion is stopped at its maximum position, the lower edge of the plunger control surface 64a is located above the upper edge of the orifice tube outlet 32d. Plunger stops at 9
2, the lower edge of the control surface of the plunger is approximately aligned with the sloping lower edge of the outlet.

Pneumatic orifice restriction device 33 also directs a cleaning fluid, such as hot water and/or caustic solution, to the orifice tube to clean the juice separation and accumulation device of citrus fruit juice extraction machine 10, particularly orifice tube 32 and filter tube 30. Contains equipment. To clean the waste separation and accumulation device, a cleaning liquid is directed under pressure into the chamber 66 of the restriction device 33 and then through the plunger 64 into a cleaning passage 94 formed axially. As liquid is pumped through the flush passageway, it opens a check control valve 96 located within the plunger flush with control surface 64a, allowing liquid to enter the lower end of the orifice tube. Liquid is in chamber 66
When the liquid is pumped to the lower end of the orifice tube, the liquid pressure automatically raises the plunger and closes the outlet 32d of the orifice tube 32, so that the liquid can only flow through the control valve 96 to the closed lower end of the orifice tube, thereby removing the remaining liquid. Pour the ivy citrus material R upwards to remove it from the orifice tube.

As shown diagrammatically in FIG. 1, the cleaning liquid is supplied to the inlet tube 67 via conduit 97 under pressure from a pump. The shuttle valve 100 is of a conventional floating ball construction and includes a liquid or air restrictor housing chamber 66.
but not both. One inlet 100b of the shuttle valve is connected to air conduit 69, and the other inlet of the shuttle valve is connected to cleaning liquid conduit 98. The shuttle valve prevents liquid from entering the pneumatic supply system and conversely air from entering the liquid supply line 98. When it is desired to wash the juice separator of the extraction machine, the pressure regulator 72 does not have to be closed. Under pressure greater than air, liquid is simply routed to line 98 and valve 100.
The shuttle bulb automatically transitions to block the flow of air from the inlet 100b to the inlet line 67 and allow liquid to flow into the inlet line 67. This washing is accomplished when the fruit is not fed to the extractor.

As previously discussed, check control valve 96 at the upper end of plunger 64 remains closed against the air pressure within chamber 66, which is the pressure set by control valve 72. However, the control valve 96 is adapted to open under pressure with the washing liquid supplied only when it is desired to wash the youth separator. The cleaning liquid is pumped 9 at a pressure much higher than air pressure.
Please note that this will be sent by 7. For example, about
An air pressure of 2.1 Kg/cm ² (approximately 30 p.si) is adequate to operate the orifice restriction device 33, and approximately 7.0 Kg/cm 2 (approx.
High liquid pressures, on the order of 100 psi (about 100 psi), are used to flush the extractor after normal operation. Control valve 96 includes a frusto-conical plug 104 housed in valve seat 106 . The valve seat is a cup-shaped member having a beveled annular edge that receives the valve plug 104 in a fluid-tight relationship therewith. The valve seat has a radially defined passageway therein that communicates with the inner surface of the valve plug 104 and the flush passageway 94. The valve seat further includes an axially extending hole therein for receiving a valve stem 108 having a plug 104 attached to one end thereof. The valve seat is received in a bore 110 formed in the plunger 64 such that its outer surface is perpendicular to the control surface 64a of the plunger and a reduced diameter bore 111 extends coaxially from the bore 110 and extends outside the valve stem. Accommodate the ends. A spring 112 is housed around the stem between the retaining ring 114 and the valve seat 106. Additionally, an O-ring 116 is housed on the valve stem to provide a fluid tight seal between the stem and the bore 111. Spring 112 holds the plug in fluid tight relationship with the valve seat against air pressure acting upwardly on the plug during normal juice brewing operations. On the other hand, the spring is configured to sag so that the valve plug opens under slightly greater liquid pressure applied when it is desired to flush the orifice tube. A passageway 120 (FIG. 2) to the atmosphere is provided to allow drainage of the chamber 66 after the scrubbing operation;
A check valve 121 is also provided in this passageway to allow outside air to enter the chamber at the end of cleaning and to allow cleaning fluid to return to pump 97. However, check valve 121 remains closed when chamber 66 is pressurized with either air or flushing fluid.

The operation of the citrus juice extractor 10 and pneumatic restriction device of the present invention will be apparent from the above description. In summary, the air pressure restriction device 33 is regulated by adjusting the control valve 72 and the filtration tube 3
When the pressure in the orifice tube 32 exceeds the preselected final pressure,
The remaining citrus material R is allowed to flow out through d. The orifice restriction device 33 then keeps the final pressure constant until the end of the juice extraction cycle. The cleaning device incorporated into the pneumatic orifice restriction device 33 is used after the juice extraction operation has ceased. Fruit F to wash the remaining waste material R from the orifice pipe.
is no longer introduced into the extractor. The extractor then operates normally, but pump 97 is activated to simultaneously pump liquid to the orifice restriction device. Pumping continues until the orifice tube, filtration tube, and juice separation and collection device are fully immersed in cleaning fluid.

[Brief explanation of the drawing]

FIG. 1 is a somewhat diagrammatic broken vertical sectional view of the citrus fruit extracting machine of the present invention, FIG. 2 is a partially enlarged sectional view showing the orifice restriction device of the extractor, and FIG. 2 is a somewhat schematic vertical cross-sectional view of the drive device; FIG. 10: Extraction machine, 12, 14: Fruit compression cup,
24: cutting knife, 30: filtration tube, 32: orifice tube, 32d: outlet, 33: pneumatic orifice restriction device, 64: plunger, 64a: control surface,
66: Chamber, 68: Diaphragm, 72: Control valve, 74: Base housing, 76: Upper housing, 96: Check control valve, 98: Washing liquid conduit.

Claims (1)

[Scope of Claims] 1. Opposing cups placed between them for squeezing citrus fruit, means connected to one of the cups for making a cut into the peel of the citrus fruit, and communicating with the cut,
A perforated filtration tube that accommodates the juice-containing filling material extruded from the fruit by a cup, and a perforated filtration tube that is reciprocably provided within the filtration tube, applies pressure to the material in the filtration tube, and squeezes out the youth in the material through the holes in the filtration tube. In a juice extraction machine for citrus fruit of the type having an orifice tube for discharging and means for collecting the juice squeezed through the filter tube, the residue material formed into the outlet of the orifice tube and forced into the orifice tube. a plunger reciprocatingly housed within the orifice tube and having a control surface at the cup-side end; fluid pressure means biased to bias the fluid pressure means such that the control surface is located within the orifice tube and communicates with the outlet when the plunger is retracted against the biased fluid pressure means; An extractor comprising means for controlling the pressure applied to the youth-containing material in the filtration tube so that the plunger does not communicate with the outlet when the plunger is sufficiently pushed into the orifice tube by the fluid pressure means. . 2. In the juice extraction machine for citrus fruits as set forth in claim 1, the control surface of the plunger is flat and inclined with respect to the axis of the orifice pipe, and presses the citrus material outward to the side of the discharge port. An extraction machine designed to do this. 3. In the juice extractor for citrus fruit according to claim 2, as the outer shape of the discharge port is moved to a position where the control surface coincides with the discharge port, the size of the discharge passage increases rapidly, An extractor that allows outflow as soon as the pressure acting on the plunger exceeds a preselected pressure. 4. The juice extractor for citrus fruits as set forth in claim 1, wherein the fluid pressure means for biasing the plunger comprises an upper housing and a device for attaching the upper housing to the end opposite the cup of the orifice tube. and a base housing that, together with the upper housing, forms a chamber directly below the plunger;
an air chamber connected in a fluid-tight manner to the plunger and further connected in a fluid-tight manner to the upper housing to define an air chamber in a space opposite to the orifice pipe of the plunger formed between the plunger and the upper housing; An extruder including a membrane forming membrane and a device for applying air to the air chamber at the selected pressure. 5. In the juice extracting machine for citrus fruits as set forth in claim 4, there is provided a passage formed through the plunger in the longitudinal direction, a control valve provided in the passage, and a control valve for directing the cleaning liquid. means for selectively pumping air into the chamber at a pressure higher than the preselected pressure, the control valve preventing air from flowing through the control valve at the selected pressure and pumping fluid at the higher pressure. An extractor that allows the flow of 6. In the juice extraction machine for citrus fruits as set forth in claim 1, the plunger has a washing passage formed in its longitudinal direction, and allows the washing liquid to flow into the orifice pipe through the washing passage. An extractor having a valve arrangement in a washing passageway for selectively pumping washing liquid through the passageway to an orifice tube. 7 at least a pair of opposing extraction cups, means for pressing one of the cups against the other, and connected to one of the cups so that when the fruit is squeezed between the cups, the inside of the fruit is squeezed; means comprising a discharge passageway for the side youth-containing portion; a perforated filtration tube for receiving the middle youth-containing portion extruded through the discharge passageway; communicating with the outer end of the orifice tube an orifice tube for expressing and containing the remaining citrus material in the orifice, selectively delivering liquid at high pressure to the orifice tube to pump the remaining citrus material out of the orifice tube; A juice extraction machine for citrus fruits that discharges water to the outside through a discharge passage. 8. A juice extractor for citrus fruit according to claim 7, wherein the device for selectively conveying the liquid to the filtration tube comprises means for forming an outlet in the orifice tube at a distance from the outer end thereof. a plunger, which is housed in the orifice tube and which normally closes the discharge port and has a passage formed throughout the plunger; and a plunger which is installed within the passage of the plunger so that liquid is delivered to the orifice tube through the passage of the plunger. An extractor including a check control valve and means for selectively directing liquid into a passageway. 9. The juice extraction machine for citrus fruit according to claim 8, wherein the plunger is reciprocably housed within the orifice tube, and the plunger is in a retracted position allowing flow through the discharge passage; an extractor movable to a closed position to prevent all flow through the discharge passageway of the tube, the pressure of the liquid on the plunger acting to hold the plunger in the closed position when the pumping device is actuated; 10 Means for squeezing the entire outer surface of the skin of a citrus fruit, means for cutting a hole in the skin of the fruit so that the middle part of the fruit containing juice is extruded from the peel through the hole, a perforated filtration tube for accommodating the same when extruded through the perforated filtration tube; reciprocatingly accommodated within the perforated filtration tube to squeeze out the juice through the holes in the filtration tube; and after the juice has been squeezed out through the filtration tube; an orifice tube in which the remaining citrus material remaining in the filtration tube is received; and an orifice tube in communication with the end of the orifice tube opposite the cutting means of the skin hole to allow the remaining citrus material to pass through the orifice tube. means for restricting the flow of citrus material, the flow restriction device including a plunger reciprocably housed within the orifice tube, the orifice tube terminating at an end portion remote from the outer end of the filter tube. and an outlet formed therein between the end portion and the outer end of the filtration tube, the flow restriction device further biasing the plunger into the orifice tube at a selected constant pressure so that the plunger A juice extractor for citrus fruit including means for controlling flow through the outlet of an orifice tube. 11. In the juice extraction machine for citrus fruit as set forth in claim 10, the flow rate restricting means further includes means for forming a passage extending longitudinally through the plunger, and a check control installed in the plunger passage. a valve and an extractor for selectively directing liquid at high pressure through the plunger passageway, thereby removing residual citrus material from the orifice tube bore. 12. Means for compressing the entire outer surface of the skin of a citrus fruit, means for cutting holes in the skin of the fruit so that the dieuse-containing middle portion of the fruit is forced out of the skin through the holes, and means for forcing the dieuse-containing material through the holes. A perforated filtration tube that accommodates the juice when it is extruded, and a filter that is accommodated in the filtration tube in a reciprocating manner, squeezes out the juice through the hole in the filtration tube, and after the juice is squeezed out through the hole, remains in the filtration tube. an orifice tube receiving in its hole the remaining citrus material, and an end of the orifice tube opposite the cutting means, selectively directing fluid under high pressure into the orifice tube to remove the remaining citrus material; A juice extraction machine for citrus fruits comprising an orifice tube and means for extruding the juice from a filtration tube.