US3921808A - Apparatus for sorting out defective ones from a continuous supply of moldings of bottomed cylindrical shape such as cups - Google Patents

Apparatus for sorting out defective ones from a continuous supply of moldings of bottomed cylindrical shape such as cups Download PDF

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Publication number
US3921808A
US3921808A US415554A US41555473A US3921808A US 3921808 A US3921808 A US 3921808A US 415554 A US415554 A US 415554A US 41555473 A US41555473 A US 41555473A US 3921808 A US3921808 A US 3921808A
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Prior art keywords
passageway
bottomed cylindrical
air
air outlet
cylindrical objects
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US415554A
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English (en)
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Yasuo Sakai
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/3404—Sorting according to other particular properties according to properties of containers or receptacles, e.g. rigidity, leaks, fill-level

Definitions

  • ABSTRACT Moldings to be sorted are successively loaded on a first passageway at a receiving end thereof, with the bottomed end of each molding directed upward, and are caused to slide toward the exit end of the passageway.
  • This first passageway has a first air outlet formed in its bottom surface at a point intermediate between both ends thereof for delivering air at a prescribed pressure into each of the moldings passing thereover, and a second air outlet is also provided which delivers as required a forced current of air across the first passageway to direct either defective or non-defective moldings into a second passageway branching off from the first passageway.
  • Both the first and second air outlets are associated with a pneumatic circuit such that in the particular embodiment disclosed herein, only non-defective moldings are directed into the second passageway while' defective ones are allowed to pass on toward the exit end of the first passageway.
  • This invention relates to an apparatus for pneumatically sorting out defective ones from a continuous supply of moldings of bottomed, substantially cylindrical shape such as cups, caps, knobs and the like. All such moldings to be sorted by this apparatus will be referred to simply as bottomed cylindrical objects throughout the rest of this specification and in the claims appended hereto, although they may not be exactly cylindrical in shape.
  • Synthetic resin moldings are subject to varieties of defects such as pinholes, cavities and deformations that are produced at the time of their manufacture, due for example to the insufficient heating of the material or to the malfunctions of the injection nozzle. Such defective products must of course be sorted out from non-defective ones prior to shipment. Conventionally, this sorting operation has been performed either manually or by means of sorting machines of the type having an indexed rotary table. Manual sorting operation is of course undesirable in view of the expenses in time and labor involved and of inevitable sorting errors. The rotary table-type sorting machines are also subject to the objection that they are highly expensive and, moreover, are capable of sorting articles of prescribed shape and size only.
  • Another object of the invention is to provide an apparatus of the character described, which is simple and inexpensive in construction and which is so compact in size that it can easily be installed in a manufacturing plant substantially as an integral part of the molding equipment.
  • this invention provides an apparatus comprising a first passageway extenting generally rectilinearly, and a second passageway branching off therefrom. Bottomed cylindrical objects to be sorted are successively loaded on the first passageway at a receiving end thereof, each with its bottomed end directed upward, and are caused to travel toward the exit end of the passageway either by gravity, by forced currents of air, or by any other suitable feed mechanisms.
  • a first air outlet is formed in the bottom surface of the first passageway at a point on the upstream side of the point where-the second passageway branches off, and a second air outlet is formed substantially in confronting relationship to the entrance of the second passageway.
  • Both the first and second air outlets are parts of a pneumatic circuit such that air is constantly flowing out of the first air'outlet at a prescribed, perhaps extremely low, pressure into each of the bottomed cylindrical objects traveling thereover.
  • a back pressure arising each time a non-defective object passes over the 2 first air outlet is sensed by means included in the pneumatic circuit, and a control valve is then opened to permit a forced current of air to be delivered out of the second, air outlet across the first passageway thereby 5 directing the non-defective object into the second passageway. No substantial back pressure develops in case defective objects pass over the first air outlet, and these are allowed to travel to the exit end of the first passageway.
  • the apparatus includes a casing 10 adapted to encase various means constituting a pneumatic circuit and so forth, the pneumatic circuit being represented in the form of a block diagram in the same drawing.
  • a first passageway 11 for a continuous stream of bottomed cylindrical objects 12 is defined generally rectilinearly on the top of the casing 10 by a pair of guides 13 serving as side walls of the passageway.
  • the first passageway 1 1 is set at a suitable angle to the plane of the horizon so that the successive bottomed cylindrical objects 12 are fed by gravity from the receiving end to the exit end, both not shown, of the passageway. It is therefore desirable that the surfaces defining this first passageway 11 be so smooth that no substantial frictional resistance is offered to the sliding motion of the bottomed cylindrical objects 12.
  • a further guide 14 in the form of a sheet of stainless steel or the like bent into the shape of an L is fastened to the front face of the casing 10 in order to readjust, if necessary, the positions of the successive bottomed cylindrical objects 12 as they are fed along the first passageway 1 l.
  • the position of this guide 14 relative to the bottom surface of the first passageway 11 is adjustable by the manual turn of thumbscrews 15 on bolts 16 that are inserted through respective slots 17 of the guide 14.
  • the first passageway 11 has a first air outlet 18 formed in its bottom surface in a position intermediate between both extremities thereof, or perhaps in a position closer to the exit end of the passageway situated to the right as seen in the drawing. Air is constantly flowing out of this first air outlet at an extremely low pressure, as hereinafter referred to in more detail.
  • a pressurizingfeed roll 19 made for example of rubber of suitable hardness is revolvably mounted above the first air outlet 18 in order to feed the successive bottomed 3 cylindrical objects 12 in close sliding contact with the bottom surface of the first passageway l l as they travel over the first air outlet 18.
  • the pressurizing feed roll 19 is in constant rotation, being fixedly mounted on one end of a shaft 20 revolvably supported by a pair of bearings 21 and driven by an electric motor 22 via an endless belt 23 running over a pair of terminal pulleys 24.
  • a mount which is movable up and down in order to adjust the position of the roll 19 relative to the bottom surface of the first passageway 11 in accordance with the height of the various bottomed cylindrical objects to be sorted by this apparatus.
  • This second passageway 26 may also be set at an angle to the plane of the horizon to make possible the gravity feed of the objects which have been fed therein by the forced current of air from the second air outlet 25.
  • a source of compressed air is provided at 27 in which air is compressed to a pressure of, say, from about 3 to 10 kilograms per square centimeter.
  • This compressed air from the source 27 is delivered via a stop valve 28 to a filter 29 where the air is separated from its water, oil and other undesirable contents.
  • the thus-filtered air is directed, on the one hand, to a precision pressure regulator 30 where the pressure of the air is reduced to, say, about 0.2 kilogram per square centimeter.
  • the air of this reduced pressure is then delivered to the first air outlet 18 via a metering valve 31 and a conduit 32.
  • the air from the filter 29 is directed, on the other hand, to a high pressure regulator 33 where the pressure of the air is regulated to a value within the range of, say, from about 2 to 3 kilograms per square centimeter, The air of this. pressure range is then delivered, as required, to the second air outlet 25 at the end of a conduit 34 via a control valve 35 of the type represented symbolically in the drawing.
  • this control valve 35 is under the control of a circuit 36 of well known construction based on the principles of fluidics (hereinafter referred to as the fluidic circuit).
  • This fluidic circuit 36 is communicated via a pneumatic amplifier 37 with the aforesaid conduit 32 leading to the first air outlet 18.
  • the fluidic circuit 36 can be communicated with an electropneumatic transducer 38 which in turn is connected to a counter 39 of well known type that produces an output pulse each time it receives a preassigned number of input pulses.
  • the counter 39 can be further connected to a totalizing counter 40 capable of registering and visually indicating a total number of the output pulses from the counter 39.
  • air gauges 41 and 42 may be equipped to the conduits 43 and 44 extending between the precision pressure regulator 30 and the metering valve 31 and between the high pressure regulator 33 and the control valve 35, respectively, to permit visual observation of the pressures of the air streams flowing out of the respective pressure regulators 30 and 33.
  • the bottomed cylindrical objects to be sorted are successively loaded on the first passageway 11 at the receiving end thereof by any suitable means, not shown, in such a manner that each object is placed with its bottomed end directed upward as seen in the drawing.
  • the successive bottomed cylindrical objects 12 travel under the guide 14 and reach the first air outlet 18, in which position each object is pressed down against the bottom surface of the first passageway by the pressurizing feed roll 19 so that the airflowing out of the first air outlet at an extremely low rate will not escape through any negligible degree of deformation or irregularity at the lower edge of the object.
  • the counter 39 produces its output signal each time it counts a predetermined number of nondefective bottomed cylindrical objects 12. This counter output signal can be utilized for the automatic control of the succeeding packaging operation or the like.
  • successive bottomed cylindrical objects 12 are fed by gravity along the first and second passageways 11 and 26, the same object can of course be accomplished by belt conveyors, by roll conveyors, by forced currents of air. or by any other similar feed mechanisms.
  • An apparatus for sorting out defective ones from a continuous supply of bottomed cylindrical objects comprising in combination:
  • a first passageway for the bottomed cylindrical objects having a receiving end and an exit end, said bottomed cylindrical objects being successively loaded on said first passageway at said receiving end thereof in such a manner that each of said bottomed cylindrical objects is placed with its bottomed end directed upward;
  • first air outlet formed in the bottom surface of said first passageway at a point intermediate between said receiving and said exit end thereof, said first air outlet being adapted to ascertain the presence of any defect in each of said bottomed cylindrical objects traveling thereover by delivering air therein at a prescribed pressure
  • a pneumatic circuit associated with said first and second air outlets, said pneumatic circuit being effec- 6 tive to cause said second air outlet to direct only a predetermined one of defective and non-defective classes of said bottomed cylindrical objects into said second passageway while the other class of said bottomed cylindrical objects are allowed to travel to said exit end of said first passageway.
  • said pneumatic circuit comprises:
  • first pressure regulating means for regulating the pressure of the air from said source
  • second pressure regulating means for regulating the pressure of the air from said source
  • control valve means communicated with said second pressure regulating means, said control valve means being normally closed;

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  • Geophysics And Detection Of Objects (AREA)
  • Sorting Of Articles (AREA)
US415554A 1972-11-17 1973-11-14 Apparatus for sorting out defective ones from a continuous supply of moldings of bottomed cylindrical shape such as cups Expired - Lifetime US3921808A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47115445A JPS4974962A (enExample) 1972-11-17 1972-11-17

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US3921808A true US3921808A (en) 1975-11-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645061A (en) * 1985-02-26 1987-02-24 Welch Hubert E Machine for stacking nestable extruded cans
US5273167A (en) * 1989-03-13 1993-12-28 Franz Haas Waffelmaschinen Industriegesellschaft M.B.H. Apparatus for stacking individual one piece receptacles

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651412A (en) * 1949-06-30 1953-09-08 Sheffield Corp Size gauging device
US3015388A (en) * 1959-05-25 1962-01-02 Crown Cork & Seal Co Cap inspection apparatus
US3258118A (en) * 1964-06-25 1966-06-28 Sheffield Corp Fluid apparatus
US3310142A (en) * 1965-10-22 1967-03-21 Continental Can Co Autoamtic cap ejector
US3716123A (en) * 1969-09-03 1973-02-13 Knorr Bremse Gmbh Apparatus for sorting elongated articles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448854A (en) * 1965-06-23 1969-06-10 Pittsburgh Railway Co Valve testing machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2651412A (en) * 1949-06-30 1953-09-08 Sheffield Corp Size gauging device
US3015388A (en) * 1959-05-25 1962-01-02 Crown Cork & Seal Co Cap inspection apparatus
US3258118A (en) * 1964-06-25 1966-06-28 Sheffield Corp Fluid apparatus
US3310142A (en) * 1965-10-22 1967-03-21 Continental Can Co Autoamtic cap ejector
US3716123A (en) * 1969-09-03 1973-02-13 Knorr Bremse Gmbh Apparatus for sorting elongated articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4645061A (en) * 1985-02-26 1987-02-24 Welch Hubert E Machine for stacking nestable extruded cans
US5273167A (en) * 1989-03-13 1993-12-28 Franz Haas Waffelmaschinen Industriegesellschaft M.B.H. Apparatus for stacking individual one piece receptacles

Also Published As

Publication number Publication date
JPS4974962A (enExample) 1974-07-19

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