EP0222344A2 - Device for testing and sorting electronic components - Google Patents

Device for testing and sorting electronic components Download PDF

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Publication number
EP0222344A2
EP0222344A2 EP86115464A EP86115464A EP0222344A2 EP 0222344 A2 EP0222344 A2 EP 0222344A2 EP 86115464 A EP86115464 A EP 86115464A EP 86115464 A EP86115464 A EP 86115464A EP 0222344 A2 EP0222344 A2 EP 0222344A2
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EP
European Patent Office
Prior art keywords
magazine
cassette
input
cassette carriage
carriage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86115464A
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German (de)
French (fr)
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EP0222344B1 (en
EP0222344A3 (en
Inventor
Ekkehard Ueberreiter
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Individual
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Individual
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Publication date
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Priority to AT86115464T priority Critical patent/ATE68115T1/en
Publication of EP0222344A2 publication Critical patent/EP0222344A2/en
Publication of EP0222344A3 publication Critical patent/EP0222344A3/en
Application granted granted Critical
Publication of EP0222344B1 publication Critical patent/EP0222344B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
    • 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
    • B07C5/36—Sorting apparatus characterised by the means used for distribution

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • Such a device is known.
  • the input magazine is displaceable perpendicular to the plane formed in the magazine channels.
  • the magazine channels are processed one after the other, i.e. the input magazine is moved one magazine channel width at a time when the components of a magazine channel have been separated and fed to the test unit.
  • the output magazine of the known device is stationary.
  • the components tested by the test unit are transferred to the selected magazine channel of the output magazine and assigned to a sort class by means of a shuttle which can be moved across the magazine channels of the output magazine and which takes a tested component from the test unit and feeds it to the magazine channel mentioned. Then the shuttle drives back to the delivery opening of the test unit.
  • the magazine channels of the input magazine have been filled with unchecked components and the tested components have been removed from the magazine channels of the output magazine by hand.
  • a magazine bar filled with components is attached to the respective input of a magazine channel of the input magazine, so that the components can slide out of the magazine bar into the magazine channel mentioned due to the inclination.
  • the tested components are removed from the magazine channels of the output magazine in an analogous manner.
  • an empty magazine rod is attached to the outlet of the magazine channel, so that the components can slide out of the magazine channel due to the inclination into the empty magazine rod.
  • the invention has for its object to improve a device of the type described above in such a way that the manual work to be performed by an operator of filling and removing the device is reduced.
  • the cassette slide on the cassette slide carrier can be moved into a position in which a magazine bar that is still filled corresponds to the magazine channel of the input magazine that has just been emptied.
  • the transfer can .angsmagazin in sliding Ei.n 9 in this way of building components of magazine rods of the cassette to the magazine channels of the input magazine at a fixed location be made.
  • This proves to be particularly advantageous if the input magazine and the test unit are arranged in a gas-filled climatic chamber.
  • the climatic chamber is supplied with either heated or cooled gas.
  • the cooled gas Especially because of the cooled gas, it must be under pressure in the climatic chamber. This is because otherwise icing would occur in the climate chamber.
  • the gas under pressure should as far as possible not escape or, with in other words, those unavoidable openings in the climate chamber through which gas can escape should be kept as small as possible.
  • Such an unavoidable opening is the place where components are fed to the input magazine. Since, as mentioned, this location remains unchanged, that is to say it is at a fixed point, the passage opening at most needs to be the size of a component.
  • a plurality of cassettes can be arranged next to one another on a cassette carriage, an additional possibility of moving the cassettes on the cassette carriage having to be provided.
  • 1 denotes a device for checking and sorting ICs.
  • This has an input magazine 2, which is provided with a multiplicity of parallel and inclined magazine channels.
  • the magazine channels are arranged one behind the other perpendicular to the plane of the drawing.
  • the input magazine 2 can be moved perpendicular to the plane of the drawing in the plane defined by the magazine channels.
  • the input magazine 2 is arranged in a climate chamber 3, which is filled with pressurized air-conditioned gas.
  • a test unit 4 is connected to the input magazine.
  • the test unit 4 is supplied with consecutively unchecked components from a magazine channel of the input magazine 2 brought into alignment with the input of the test unit, after they have been separated beforehand.
  • the components are then checked in the test unit 4 and assigned to a sorting class.
  • the corresponding sorting signal controls the drive of a movable shuttle 5, which takes a tested component from the test unit 4 and feeds it to a magazine channel of a fixed output magazine 6.
  • the output magazine 6 has a multiplicity of magazines running in parallel channels that lie in a plane perpendicular to the drawing plane.
  • the channels of the output magazine 6 are also inclined, so that the components slide downward due to gravity. The same applies to the magazine channels of the input magazine 2.
  • Carrier jaws 7 are attached to the side walls of the device 1 in the area of the input magazine 2, between which a pivot shaft 9 extends.
  • a cassette carriage carrier 8 On this pivot shaft 9 there is a cassette carriage carrier 8 which in turn carries a cassette carriage 10 which can be displaced in the direction of the double arrow on the cassette carriage carrier.
  • the cassette carriage 10 carries an exchangeable cassette 11, in which in turn a multiplicity of magazine bars 12 are interchangeably arranged.
  • Lateral support jaws 7a are also fastened at the outlet of the device 1 in the region of the outlet magazine 6, between which a pivot shaft 9a extends.
  • a cassette carriage carrier 8a which has a cassette carriage 10a, which can likewise be displaced in the direction of the double arrow, is pivotably attached to this.
  • the cassette carriage 10a carries a cassette 11a with magazine bars 12a. The situation here is completely analogous to that of the cassette carriage carrier with cassette carriage at the entrance to the device. Therefore, only one of these two additional devices will be described below.
  • Figure 2 show. the carrier cheek 7, the cassette carriage carrier 8, the cassette carriage 10 and the cassette 11 in an enlarged view.
  • the cassette carriage carrier 8 is pivotally attached to the pivot shaft 9 by means of link plates 13.
  • the link plates 13 (only one of which is visible in FIG. 2) sit on a base plate 14.
  • Two side walls 15 are fastened to the base plate 14 (only one of which is visible in FIG. 2).
  • Guide rails 16 extend inwards from the side walls 15.
  • the cassette carriage 10 runs on these guide rails 16 with guide rollers 35, 36 attached to it.
  • the base plate 14 of the cassette carriage carrier 8 On the base plate 14 of the cassette carriage carrier 8, holders 16, 17 are also provided for a locking rail 17, the meaning of which will be explained below. Furthermore, the base plate 14 of the cassette carriage carrier 8 has an opening 18 through which a clamping device 19 which can be actuated by a hand lever 20 extends. By actuating the hand lever 20, the cassette carrier slide 8 can be clamped or released on the carrier cheeks 7 such that the cassette carrier carrier 8 can be pivoted away from the device 1 about the pivot shaft 9.
  • the base plate 14 is provided with a further opening 21 through which a mouthpiece 23 extends, which is connected to the base plate 14 by a mounting bracket 22 and a bearing pin 24.
  • the mouthpiece 23 has a transfer channel 28, which in each case connects the outlet of a magazine rod 12 located in a cassette 11 to a magazine channel of the input magazine.
  • a conveyor wheel 25 projects into the transfer channel 28 and, in conjunction with a light barrier consisting of light transmitter 26 and light receiver 27, forms a separating device known per se.
  • the components 51 emerging from a magazine rod are separated with the feed wheel 25 and then fed to a magazine channel of the input magazine 2.
  • a tongue 29 is located on the end of the mouthpiece 23 facing the input magazine 2, which tongue engages in a groove 52 on the displaceable input magazine and ensures that the transfer channel 28 in any case with a magazine channel of the input magazine 2 in the height corresponds.
  • the cassette carriage 10 is provided on its underside with a toothed rack 33 which has a plurality of toothed slots 34.
  • An eccentric drive for the cassette carriage 10 is located on the base plate 14 of the cassette slide carrier 8.
  • a carrier disk with two eccentric pins 31, 32 is visible from this, each of which engages in a toothed slot 34.
  • This known transport mechanism ensures a precisely defined advancement of the cassette carriage 10 and, in the position shown, the eccentric pins 31, 32, a self-locking mechanism against displacement.
  • the holder 38 is provided with a cylindrical locking element 40 which can engage in a wedge-shaped recess 39 on the cassette 11.
  • the holder 38a carries a two-armed lever 43, one arm of which can be actuated as a hand lever and the other arm also has a cylindrical latching element 42 which engages in a corresponding wedge-shaped latching recess 41 in the cassette 11. The cassette can be released or locked by pivoting the lever 43.
  • a cassette is shown in more detail in FIGS. 3 and 4.
  • This consists of two side parts 44, 45, which are connected by interchangeable spacers 46, 47.
  • the cassette can be used for different bar magazines 12.
  • the side parts 44, 45 On the inside, the side parts 44, 45 have closure strips 48, 49 which are pressed inwards by means of springs (not shown) into the closed position and thereby partially close the outputs of the magazine rods 12, so that no components can emerge from the magazine rods 12.
  • the side parts 44, 45 have receiving slots 50 for the magazine rods 12 on their inside. In this way, a plurality of magazine bars 12 can be inserted into the cassette 11 in parallel.
  • the cassette carriage 10 is shown in a position in which components from magazine bars 12 to the input magazine 2 cannot yet be transferred via the mouthpiece 23.
  • only components 51 can emerge from the magazine rod 12 which is aligned with the transfer channel 28 of the mouthpiece 23.
  • the remaining magazine bars 12, which are still filled, are closed by the closure rail 17 described above, which lies in the gap between the two closure strips 48, 49 and is firmly connected to the cassette slide carrier 8.
  • FIGS. 2 to 4 describe the additional device in connection with the input magazine.
  • the function of the additional device with the output magazine is analog.
  • the feed wheel 25 of the separating device only has to convey in the opposite direction.

Landscapes

  • Testing Of Individual Semiconductor Devices (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Testing Or Measuring Of Semiconductors Or The Like (AREA)

Abstract

To reduce manual work by an operator filling and unloading a device for testing and sorting electronic components it is suggested that a cassette carriage carrier (8) with a cassette carriage (10) displaceable therein, be placed in front of the input magazine (2). The cassette carriage (10) carries a cassette (11), on which a large number of magazine rods (12) are arranged side by side. The magazine rods (12) are displaceable and arranged on a plane which extends perpendicularly to the plane of the magazine channels of the input magazine (2) of the device (1). In the same way there can be provision for a cassette carriage carrier (8a) with a cassette (10a) and a cassette (11a) as well as the magazine rods (12a) attached to it in connection with the output magazine (6) of the device (1).

Description

Die Erfindung betrifft eine Vorrichtung gemäß Oberbegriff des Anspruches 1.The invention relates to a device according to the preamble of claim 1.

Eine derartige Vorrichtung ist bekannt. Bei dieser bekannten Vorrichtung ist das Eingangsmagazin senkrecht zu den Magazinkanälen gebildeten Ebene verschiebbar. Die Magazinkanäle werden nacheinander abgearbeitet, d.h. das Eingangsmagazin wird jeweils um eine Magazinkanalbreite weitergeschoben, wenn die Bauelemente eines Magazinkanales vereinzelt und der Prüfeinheit zugeführt worden sind. Das Ausgangsmagazin der bekannten Vorrichtung ist stationär. Die Überführung der von der Prüfeinheit geprüften Bauelemente zu dem ausgewählten und einer Sortierklasse zugeordneten Magazinkanal des Ausgangsmagazins erfolgt mit einem quer zu den Magazinkanälen des Ausgangsmagazins verfahrbaren Shuttle, das jeweils ein geprüftes Bauelement aus der Prüfeinheit entnimmt und dem erwähnten Magazinkanal zuführt. Dann fährt das Shuttle wieder zur Abgabeöffnung der Prüfeinheit zurück.Such a device is known. In this known device, the input magazine is displaceable perpendicular to the plane formed in the magazine channels. The magazine channels are processed one after the other, i.e. the input magazine is moved one magazine channel width at a time when the components of a magazine channel have been separated and fed to the test unit. The output magazine of the known device is stationary. The components tested by the test unit are transferred to the selected magazine channel of the output magazine and assigned to a sort class by means of a shuttle which can be moved across the magazine channels of the output magazine and which takes a tested component from the test unit and feeds it to the magazine channel mentioned. Then the shuttle drives back to the delivery opening of the test unit.

Das Befüllen der Magazinkanäle des Eingangsmagazins mit ungeprüften Bauelementen sowie die Entnahme der geprüften Bauelemente aus den Magazinkanälen des Ausgangsmagazins erfolgt bisher von Hand. Im Falle des Eingangsmagazins wird dazu eine mit Bauelementen gefüllte Magazinstange an den jeweiligen Eingang eines Magazinkanals des Eingangsmagazins angesetzt, so daß die Bauelemente aus der Magazinstange in den erwähnten Magazinkanal infolge der Neigung hineingleiten können. In analoger Weise erfolgt die Entnahme der geprüften Bauelemente aus den Magazinkanälen des Ausgangsmagazins. Hier wird jeweils eine leere Magazinstange an den Ausgang des Magazinkanals angesetzt, so daß die Bauelemente aus dem Magazinkanal infolge der Neigung in die leere Magazinstange gleiten können.Up to now, the magazine channels of the input magazine have been filled with unchecked components and the tested components have been removed from the magazine channels of the output magazine by hand. In the case of the input magazine, a magazine bar filled with components is attached to the respective input of a magazine channel of the input magazine, so that the components can slide out of the magazine bar into the magazine channel mentioned due to the inclination. The tested components are removed from the magazine channels of the output magazine in an analogous manner. Here will an empty magazine rod is attached to the outlet of the magazine channel, so that the components can slide out of the magazine channel due to the inclination into the empty magazine rod.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorichtung der zuvor beschriebenen Art dahingehend zu verbessern, daß die von einer Bedienungsperson vorzunehmende Handarbeit des Befüllens und der Entnahme der Vorrichtung reduziert wird.The invention has for its object to improve a device of the type described above in such a way that the manual work to be performed by an operator of filling and removing the device is reduced.

Die Aufgabe ist erfindungsgemäß durch die im Kennzeichen des Anspruches 1 angegebenen Merkmale gelöst.The object is achieved by the features specified in the characterizing part of claim 1.

In Verbindung mit dem Eingangsmagazin ist es nunmehr möglich, denjenigen Magazinkanal des Eingangsmagazins, der gerade abgearbeitet worden ist, unmittelbar danach neu zu befüllen, indem ihm neue Bauelemente von einer Magazinstange der Kassette zugeführt werden. Dazu kann der Kassettenschlitten auf dem Kassettenschlitten-Träger in eine Stellung verschoben werden, in der eine noch gefüllte Magazinstange mit dem gerade entleerten Magazinkanal des Eingangsmagazins korrespondiert. Bei verschiebbarem Ei.n9.angsmagazin kann auf diese Weise die Überführung von Bauelementen aus Magazinstangen der Kassette zu Magazinkanälen des Eingangsmagazin an einem feststehenden Ort erfolgen. Dies erweist sich dann als besonders vorteilhaft, wenn das Eingangsmagazin und die Prüfeinheit in einer gasgefüllten Klimakammer angeordnet sind. Der Klimakammer wird entweder erhitztes oder gekühltes Gas zugeführt. Insbesondere wegen des gekühlten Gases muß dieses in der Klimakammer unter Überdruck stehen. Dies deshalb, weil andernfalls in der Klimakammer eine Vereisung auftreten würde. Das unter Überdruck stehende Gas soll jedoch möglichst nicht entweichen oder, mit anderen Worten, diejenigen unvermeidbaren Öffnungen der Klimakammer, durch die Gas ausströmen kann, sollen so klein wie möglich gehalten werden. Eine solche unvermeidbare Öffnung ist der Ort der Zuführung von Bauelementen zum Eingangsmagazin. Da, wie erwähnt, dieser Ort unverändert bleibt, also an einer fixen Stelle liegt, braucht die Durchtrittsöffnung allenfalls die Größe eines Bauelementes zu haben.In connection with the input magazine, it is now possible to refill the magazine channel of the input magazine that has just been processed immediately afterwards by feeding new components from a magazine bar of the cassette. For this purpose, the cassette slide on the cassette slide carrier can be moved into a position in which a magazine bar that is still filled corresponds to the magazine channel of the input magazine that has just been emptied. The transfer can .angsmagazin in sliding Ei.n 9 in this way of building components of magazine rods of the cassette to the magazine channels of the input magazine at a fixed location be made. This proves to be particularly advantageous if the input magazine and the test unit are arranged in a gas-filled climatic chamber. The climatic chamber is supplied with either heated or cooled gas. Especially because of the cooled gas, it must be under pressure in the climatic chamber. This is because otherwise icing would occur in the climate chamber. However, the gas under pressure should as far as possible not escape or, with in other words, those unavoidable openings in the climate chamber through which gas can escape should be kept as small as possible. Such an unavoidable opening is the place where components are fed to the input magazine. Since, as mentioned, this location remains unchanged, that is to say it is at a fixed point, the passage opening at most needs to be the size of a component.

Wenn die Kapazität für die Zuführung von Bauelementen noch erhöht werden soll, können auf einem Kassettenschlitten mehrere Kassetten nebeinander angeordnet werden, wobei eine zusätzliche Verschiebemöglichkeit für die Kassetten auf dem Kassettenschlitten vorgesehen werden muß.If the capacity for feeding components is to be increased, a plurality of cassettes can be arranged next to one another on a cassette carriage, an additional possibility of moving the cassettes on the cassette carriage having to be provided.

Wenn ein Kassettenschlitten-Trägermit Kassettenschlitten in Verbindung mit einem feststehenden Ausgangsmagazin verwendet werden soll, so besteht die Möglichkeit, mehrere Kassettenschlitten-Träger mit Kassettenschlitten parallel so anzuordnen, daß jeder von ihnen mit einem bestimmten Magazinkanal des Ausgangsmagazins korrespondiert.When a cassette carriage-T is to be räger used with cassette carriage in conjunction with a fixed output magazine, there is a possibility of multiple K leaving tten sled carrier with cassette carriage to be arranged in parallel so that each corresponds of them with a specific magazine channel of the output magazine.

Die vorstehend beschriebenen Weiterbildungen der Erfindungsmerkmale nach Anspruch 1 sind Gegenstand der Ansprüche 2 bis 4.The developments of the inventive features according to claim 1 described above are the subject of claims 2 to 4.

Andere Weiterbildungen, deren Vorteile sich aus der Beschreibung des Ausführungsbeispieles ergeben, sind in den Ansprüchen 5 bis 11 beschrieben.Other developments, the advantages of which result from the description of the exemplary embodiment, are described in claims 5 to 11.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnungen beschrieben.An embodiment of the invention is described below with reference to the drawings.

Es zeigen:

  • Fig. 1 eine schematisierte Seitenansicht einer Vorrichtungzum Prüfen und Sortieren von elektronischen Bauelementen, bei der sowohl am Eingang als auch am Ausgang ein Kassettenschlitten-Träger mit Kassettenschlitten, Kassette und Magazinstangen angesetzt ist;
  • Fig. 2 eine vergrößerte Darstellung des Kassettenschlitten-Trägers, des Kassettenschlittens und der Kassette;
  • Fig. 3 eine perspektifische Darstellung der Kassette;
  • Fig. 4 eine Ansicht IV-IV aus Fig. 3.
Show it:
  • Fig. 1 is a schematic side view of a device for checking and sorting electronic components, in which a cassette carriage carrier with cassette carriage, cassette and magazine bars is attached to both the entrance and the exit;
  • Fig. 2 is an enlarged view of the cassette carriage carrier, the cassette carriage and the cassette;
  • Fig. 3 is a perspective view of the cassette;
  • 4 shows a view IV-IV from FIG. 3.

In Figur 1 ist mit 1 eine Vorrichtung zum Prüfen und Sortieren von IC's bezeichnet. Diese weist ein Eingangsmagazin 2 auf, welches mit einer Vielzahl von parallel verlaufenden und geneigt angeordneten Magazinkanälen versehen ist. Die Magazinkanäle sind senkrecht zur Zeichenebene hintereinander angeordnet. Das Eingangsmagazin 2 ist senkrecht zur Zeichenebene in der von den Magazinkanälen definierten Ebene verfahrbar. Das Eingangsmagazin 2 ist in einer Klimakammer 3 angeordnet, die mit unter Druck stehendem klimatisiertem Gas gefüllt ist. An das Eingangsmagazin schließt sich eine Prüfeinheit 4 an. Der Prüfeinheit 4 werden nacheinander ungeprüfte Bauelemente aus einem in Flucht mit dem Eingang der Prüfeinheit gebrachten Magazinkanal des Eingangsmagazins 2 zugeführt, nachdem sie vorher vereinzelt worden sind.In FIG. 1, 1 denotes a device for checking and sorting ICs. This has an input magazine 2, which is provided with a multiplicity of parallel and inclined magazine channels. The magazine channels are arranged one behind the other perpendicular to the plane of the drawing. The input magazine 2 can be moved perpendicular to the plane of the drawing in the plane defined by the magazine channels. The input magazine 2 is arranged in a climate chamber 3, which is filled with pressurized air-conditioned gas. A test unit 4 is connected to the input magazine. The test unit 4 is supplied with consecutively unchecked components from a magazine channel of the input magazine 2 brought into alignment with the input of the test unit, after they have been separated beforehand.

Die Bauelemente werden dann in der Prüfeinheit 4 geprüft und einer Sortierklasse zugeordnet. Mit dem entsprechenden Sortiersignal wird der Antrieb eines verfahrbaren Shuttles 5 gesteuert, der jeweils ein geprüftes Bauelement aus der Prüfeinheit 4 entnimmt und einem Magazinkanal eines feststehenden Ausgangsmagazins 6 zuführt. Das Ausgangsmagazin 6 hat eine Vielzahl von parallel verlaufenden Magazinkanälen, die in einer senkrecht zur Zeichenebene verlaufenden Ebene liegen. Auch die Kanäle des Ausgangsmagazins 6 sind geneigt angeordnet, so daß die Bauelemente darin durch die Schwerkraft nach unten rutschen. Das gleiche gilt für die Magazinkanäle des Eingangsmagazins 2.The components are then checked in the test unit 4 and assigned to a sorting class. The corresponding sorting signal controls the drive of a movable shuttle 5, which takes a tested component from the test unit 4 and feeds it to a magazine channel of a fixed output magazine 6. The output magazine 6 has a multiplicity of magazines running in parallel channels that lie in a plane perpendicular to the drawing plane. The channels of the output magazine 6 are also inclined, so that the components slide downward due to gravity. The same applies to the magazine channels of the input magazine 2.

An die Seitenwände der Vorrichtung 1 sind im Bereich des Eingangsmagazins 2 Trägerbacken 7 angesetzt, zwischen denen sich eine Schwenkwelle 9 erstreckt. Auf dieser Schwenkwelle 9 sitzt ein Kassettenschlitten-Träger 8, welcher seinerseits einen Kassettenschlitten 10 trägt, der in Richtung des Doppelpfeiles auf dem Kassettenschlitten-Träger verschiebbar ist. Der Kassettenschlitten 10 trägt eine auswechselbare Kassette 11, in der wiederum eine Vielzahl von Magazinstangen 12 auswechselbar angeordnet sind.Carrier jaws 7 are attached to the side walls of the device 1 in the area of the input magazine 2, between which a pivot shaft 9 extends. On this pivot shaft 9 there is a cassette carriage carrier 8 which in turn carries a cassette carriage 10 which can be displaced in the direction of the double arrow on the cassette carriage carrier. The cassette carriage 10 carries an exchangeable cassette 11, in which in turn a multiplicity of magazine bars 12 are interchangeably arranged.

Auch am Ausgang der Vorrichtung 1 sind im Bereich des Ausgangsmagazines 6 seitliche Trägerbacken 7a befestigt, zwischen denen sich eine Schwenkwelle 9a erstreckt. An dieser ist schwenkbar ein Kassettenschlitten-Träger 8a befestigt, der einen Kassettenschlitten 10a aufweist, welcher ebenfalls in-Richtung des Doppelpfeiles verschiebbar ist. Der Kassettenschlitten 10a trägt eine Kassette lla mit Magazinstangen.12a. Die Verhältnisse sind hier völlig analog zu denen des Kassettenschlitten-Trägers mit Kassettenschlitten am Eingang der Vorrichtung. Es soll deshalb nachfolgend nur eine dieser beiden Zusatzvorrichtungen beschrieben werden.Lateral support jaws 7a are also fastened at the outlet of the device 1 in the region of the outlet magazine 6, between which a pivot shaft 9a extends. A cassette carriage carrier 8a, which has a cassette carriage 10a, which can likewise be displaced in the direction of the double arrow, is pivotably attached to this. The cassette carriage 10a carries a cassette 11a with magazine bars 12a. The situation here is completely analogous to that of the cassette carriage carrier with cassette carriage at the entrance to the device. Therefore, only one of these two additional devices will be described below.

Figur 2 zeig. die Trägerwange 7, den Kassettenschlitten-Träger 8, den Kassettenschlitten 10 und die Kassette 11 in vergrößerter Darstellung. Der Kassettenschlitten-Träger 8 ist an der Schwenkwelle 9 mit Gelenklaschen 13 schwenkbar befestigt. Die Gelenklaschen 13 (von denen in Fig. 2 nur eine sichtbar ist) sitzen an einer Grundplatte 14. An der Grundplatte 14 sind zwei Seitenwände 15 befestigt (von denen in Fig. 2 nur eine sichtbar ist). Von den Seitenwänden 15 aus erstrecken sich Führungsschienen 16 nach innen. Auf diesen Führungsschienen 16 läuft der Kassettenschlitten 10 mit an ihm befestigten Führungsrollen 35,36.Figure 2 show. the carrier cheek 7, the cassette carriage carrier 8, the cassette carriage 10 and the cassette 11 in an enlarged view. The cassette carriage carrier 8 is pivotally attached to the pivot shaft 9 by means of link plates 13. The link plates 13 (only one of which is visible in FIG. 2) sit on a base plate 14. Two side walls 15 are fastened to the base plate 14 (only one of which is visible in FIG. 2). Guide rails 16 extend inwards from the side walls 15. The cassette carriage 10 runs on these guide rails 16 with guide rollers 35, 36 attached to it.

An der Grundplatte 14 des Kassettenschlitten-Trägers 8 sind ferner Halterungen 16,17 für eine Verschlußschiene 17 vorgesehen, deren Bedeutung noch erklärt wird. Weiterhinweist die Grundplatte 14 des Kassettenschlitten-Trägers 8 eine Öffnung 18 auf, durch die sich eine mit einem Handhebel 20 betätigbare Klemmvorrichtung 19 erstreckt. Durch Betätigung des Handhebels 20 kann der Kassetten-Träger-Schlitten 8 an den Trägerwangen 7 festgeklemmt oder gelöst werden, derart, daß der Kassettenschlitten-Träger 8 um die Schwenkwelle 9 von der Vorrichtung 1 wegschwenkbar ist.On the base plate 14 of the cassette carriage carrier 8, holders 16, 17 are also provided for a locking rail 17, the meaning of which will be explained below. Furthermore, the base plate 14 of the cassette carriage carrier 8 has an opening 18 through which a clamping device 19 which can be actuated by a hand lever 20 extends. By actuating the hand lever 20, the cassette carrier slide 8 can be clamped or released on the carrier cheeks 7 such that the cassette carrier carrier 8 can be pivoted away from the device 1 about the pivot shaft 9.

Die Grundplatte 14 ist mit einer weiteren Öffnung 21 versehen, durch die sich ein Mundstück 23 erstreckt, welches mit der Grundplatte 14 durch einen Halterungsbügel 22 sowie einen Lagerstift 24 verbunden ist. Das Mundstück 23 weist einen Überführungskanal 28 auf, welcher jeweils den Ausgang einer in einer Kassette 11 befindlichen Magazinstange 12 mit einem Magazinkanal des Eingangsmagazins verbindet. In den Überführungskanal 28 ragt ein Förderrad 25, das in Verbindung mit einer Lichtschranke, bestehend aus Lichtgeber 26 und Lichtempfänger 27 eine an sich bekannte Vereinzelungsvorrichtung bildet. Mit dem Förderrad 25 werden die aus einer Magazinstange austretenden Bauelemente 51 vereinzelt und dann einem Magazinkanal des Eingangsmagazins 2 zugeführt.The base plate 14 is provided with a further opening 21 through which a mouthpiece 23 extends, which is connected to the base plate 14 by a mounting bracket 22 and a bearing pin 24. The mouthpiece 23 has a transfer channel 28, which in each case connects the outlet of a magazine rod 12 located in a cassette 11 to a magazine channel of the input magazine. A conveyor wheel 25 projects into the transfer channel 28 and, in conjunction with a light barrier consisting of light transmitter 26 and light receiver 27, forms a separating device known per se. The components 51 emerging from a magazine rod are separated with the feed wheel 25 and then fed to a magazine channel of the input magazine 2.

Um eine saubere Zentrierung zu gewährleisten, befindet sich an dem dem Eingangsmagazin 2 zugewandten Ende des Mundstückes 23 eine Zunge 29, die in eine Nute 52 an dem verschiebbaren Eingangsmagazin eingreift und gewährleistet, daß der Überführungskanal 28 in jedem Fall mit einem Magazinkanal des Eingangsmagazins 2 in der Höhe korrespondiert.In order to ensure a clean centering, a tongue 29 is located on the end of the mouthpiece 23 facing the input magazine 2, which tongue engages in a groove 52 on the displaceable input magazine and ensures that the transfer channel 28 in any case with a magazine channel of the input magazine 2 in the height corresponds.

Der Kassettenschlitten 10 ist an seiner Unterseite mit einer Zahnstange 33 versehen, die eine Vielzahl von Zahnschlitzen 34 aufweist. Auf der Grundplatte 14 des Kassettenschlitten-Trägers 8 befindet sich ein Exzenterantrieb für den Kassettenschlitten 10. Von diesem ist eine Trägerscheibe mit zwei Exzenterstiften 31,32 sichtbar, von denen jeder in einen Zahnschlitz 34 eingreift. Dieser an sich bekannte Transportmechanismus gewährleistet ein genau definiertes Weiterschalten des Kassettenschlittens 10 und in der dargestellten Stellung der Exzenterstifte 31,32 eine Selbstarretierung gegen ein Verschieben.The cassette carriage 10 is provided on its underside with a toothed rack 33 which has a plurality of toothed slots 34. An eccentric drive for the cassette carriage 10 is located on the base plate 14 of the cassette slide carrier 8. A carrier disk with two eccentric pins 31, 32 is visible from this, each of which engages in a toothed slot 34. This known transport mechanism ensures a precisely defined advancement of the cassette carriage 10 and, in the position shown, the eccentric pins 31, 32, a self-locking mechanism against displacement.

Auf dem Kassettenschlitten 10 sitzen zwei Halterungen 38, 38a für eine Kassette 11. Die Halterung 38 ist mit einem zylinderförmigen Rastelement 40 versehen, das in eine keilförmige Rastausnehmung 39 an der Kassette 11 eingreifen kann. Die Halterung 38a trägt einen zweiarmigen Hebel 43, dessen einer Arm als Handhebel betätigbar ist und dessen anderer Arm ebenfalls ein zylinderförmiges Rastelement 42 aufweist, das in eine entsprechende keilförmige Rastausnehmung 41 der Kassette 11 eingreift. Durch Schwenken des Hebels 43 kann die Kassette gelöst bzw. arret ert werden.Two holders 38, 38a for a cassette 11 are seated on the cassette carriage 10. The holder 38 is provided with a cylindrical locking element 40 which can engage in a wedge-shaped recess 39 on the cassette 11. The holder 38a carries a two-armed lever 43, one arm of which can be actuated as a hand lever and the other arm also has a cylindrical latching element 42 which engages in a corresponding wedge-shaped latching recess 41 in the cassette 11. The cassette can be released or locked by pivoting the lever 43.

In den Figuren 3 und 4 ist eine Kassette genauer dargestellt. Diese besteht aus zwei Seitenteilen 44,45, die durch auswechselbare Distanzstücke 46,47 miteinander verbunden sind. Durch Wahl von Distanzstücken unterschiedlicher Länge kann die Kassette für verschiedene Stangenmagzine 12 verwendet werden. An der Innenseite weisen die Seitenteile 44,45 Verschlußleisten 48,49 auf, die mittels (nicht dargestellten) Federn nach innen in die Verschlußposition gedrückt werden und dadurch die Ausgänge der Magazinstangen 12 teilweise verschließen, so daß aus den Magazinstangen 12 keine Bauelemente austreten können. Ferner weisen die Seitenteile 44,45 an ihrer Innenseite Aufnahmeschlitze 50 für die Magazinstangen 12 auf. Auf diese Weise kann eine Vielzahl von Magazinstangen 12 parallel in die Kassette 11 eingeschoben werden.A cassette is shown in more detail in FIGS. 3 and 4. This consists of two side parts 44, 45, which are connected by interchangeable spacers 46, 47. By selecting spacers of different lengths, the cassette can be used for different bar magazines 12. On the inside, the side parts 44, 45 have closure strips 48, 49 which are pressed inwards by means of springs (not shown) into the closed position and thereby partially close the outputs of the magazine rods 12, so that no components can emerge from the magazine rods 12. Furthermore, the side parts 44, 45 have receiving slots 50 for the magazine rods 12 on their inside. In this way, a plurality of magazine bars 12 can be inserted into the cassette 11 in parallel.

In Figur 2 ist der Kassettenschlitten 10 in einer Stellung gezeigt, in der noch keine Überführung von Bauelementen aus Magazinstangen 12 zum Eingangsmagazin 2 über das Mundstück 23 erfolgen kann. Dazu ist es erst notwendig, den Kassettenschlitten 10 auf dem Kassettenschlitten-Träger 8 nach unten zu verschieben. Wenn diese Verschiebung nach unten erfolgt,so schiebt sich ein fest am Mundstück 23 befestigtes Öffnungselement 37 zwischen die Verschlußleisten 48,49 der Kassette 11 und drückt diese entgegen der Wirkung der Federn nach außen. Dadurch wird die Ausgangsöffnung der Magazinstangen 12 zum Austritt von Bauelementen freigegeben. Es können jedoch nur Bauelemente 51 aus derjenigen Magazinstange 12 austreten, die mit dem Überführungskanal 28 des Mundstückes 23 fluchtet. Die übrigen noch gefüllten Magazinstangen 12 werden durch die oben beschriebene Verschlußschiene 17 verschlossen,welche in dem Spalt zwischen den beiden Verschlußleisten 48,49 liegt und fest mit dem Kassettenschlitten-Träger 8 verbunden ist. Beim weiterschieben des Kassettenschlittens 10 treten dieIn Figure 2, the cassette carriage 10 is shown in a position in which components from magazine bars 12 to the input magazine 2 cannot yet be transferred via the mouthpiece 23. To do this, it is first necessary to move the cassette carriage 10 downward on the cassette carriage carrier 8. If this displacement takes place downwards, an opening element 37, which is fixedly attached to the mouthpiece 23, is pushed between the closure strips 48, 49 of the cassette 11 and presses it outward against the action of the springs. As a result, the outlet opening of the magazine rods 12 is released for the exit of components. However, only components 51 can emerge from the magazine rod 12 which is aligned with the transfer channel 28 of the mouthpiece 23. The remaining magazine bars 12, which are still filled, are closed by the closure rail 17 described above, which lies in the gap between the two closure strips 48, 49 and is firmly connected to the cassette slide carrier 8. When pushing the cassette carriage 10 forward

Magazinstangen 12 der Kassette 11 aus dem Fluchtbereich des Überführungskanales 28 sowie aus dem Bereich, in dem sie durch die Verschlußschiene 17 verschlossen werden. Sie sind also unverschlossen. Dies ist jedoch insofern ohne Bedeutung, als sie keine Bauelemente mehr enthalten.Magazine bars 12 of the cassette 11 from the escape area of the transfer channel 28 and from the area in which they are closed by the closure rail 17. So you are unlocked. However, this is irrelevant insofar as they no longer contain any components.

Wie eingangs beschrieben, ist es auch möglich, mehrere Kassetten 11 auf dem Kassettenschlitten 10 nebeneinander anzuordnen. Die zylinderartigen Rastelemente 40 und 42 dienen dann als Führungen für ein notwendiges seitliches Verschieben der Kassetten, so daß eine nach der anderen in Be- bzw. Entladeposition gebracht wird. Der Verschiebeantrieb ist hier nicht gezeichnet.As described at the beginning, it is also possible to arrange a plurality of cassettes 11 next to one another on the cassette carriage 10. The cylinder-like locking elements 40 and 42 then serve as guides for a necessary lateral displacement of the cassettes, so that one after the other is brought into the loading or unloading position. The slide drive is not shown here.

IN den Figuren 2 bis 4 wurde die Zusatzeinrichtung in Verbindung mit dem Eingangsmagazin beschrieben. Die Funktion der Zusatzeinrichtung mit dem Ausgangsmagazin ist analog. Hier muß das Förderrad 25 der Vereinzelungsvorrichtung lediglich in umgekehrter Richtung fördern.FIGS. 2 to 4 describe the additional device in connection with the input magazine. The function of the additional device with the output magazine is analog. Here, the feed wheel 25 of the separating device only has to convey in the opposite direction.

Claims (11)

1. Vorrichtung zum Prüfen und Sortieren von elektronischen Bauelementen, insbesondere solchen mit integrierten Schaltungen (IC's),mit einem Eingangsmagazin, das eine Mehrzahl von parallel nebeneinander angeordneten und geneigt verlaufenden Magazinkanälen aufweist, mit einer sich daran anschließenden Prüfeinheit, und mit einem Ausgangsmagazin, das ebenfalls eine Mehrzahl von parallel nebeneinander angeordneten und geneigt verlaufenden Magazinkanälen aufweist, dadurch gekennzeichnet, daß am Eingang des Eingangsmagazins (2) und/oder am Ausgang des Ausgangsmagazins (6) mindestens ein Kassettenschlitten--Träger (8) mit Kassettenschlitten (10) angeordnet ist, daß der Kassettenschlitten (10) mindestens eine auswechselbare Kassette (11) mit einer Mehrzahl von parallel nebeneinander angeordneten auswechselbaren Magazinstangen (12) aufweist, die eine Fläche, vorzugsweise eine Ebene definieren, in der auch der Kassettenschlitten (10) verschiebbar ist, und daß die von den Magazinstangen (12) definierte Fläche bzw. Ebene die von den Magazinkanälen des Eingangs- bzw. Ausgangsmagazins definierte Fläche, die ebenfalls vorzugsweise eine Ebene ist, kreuzt.1.Device for testing and sorting electronic components, in particular those with integrated circuits (IC's), with an input magazine which has a plurality of magazine channels arranged in parallel and inclined, with an adjoining test unit, and with an output magazine which also has a plurality of parallel and inclined magazine channels, characterized in that at least one cassette slide carrier (8) with a cassette slide (10) is arranged at the input of the input magazine (2) and / or at the output of the output magazine (6) that the cassette carriage (10) has at least one interchangeable cassette (11) with a plurality of interchangeable magazine bars (12) arranged parallel to one another, which define a surface, preferably a plane, in which the cassette carriage (10) can also be displaced, and that from the magazine bars (12) defin ized surface or plane crosses the surface defined by the magazine channels of the input or output magazine, which is also preferably a plane. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet daß bei quer zur Längsrichtung der Magazinkanäle verschiebbarem und in einer gasgefüllten Klimakammer (3) angeordnetem Eingangsmagazin (2) in der Klimakammer (3) eine minimal kleine Öffnung (21) zur Überführung von Bauelementen (51) aus einer Magazinstange (12) der Kassette (11) zu einem Magazinkanal des Eingangsmagazins (2) vorgesehen ist. 2nd Apparatus according to claim 1, characterized in that when the input magazine (2) is displaceable transversely to the longitudinal direction of the magazine channels and is arranged in a gas-filled climatic chamber (3), a minimally small opening (21) for transferring components (51) extends out of the climatic chamber (3) a magazine bar (12) of the cassette (11) is provided to a magazine channel of the input magazine (2). 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Kassettenschlitten (10) mit mehreren quer zu seiner Verschieberichtung nebeneinander angeordneten Kassetten (11) bestückbar ist, und daß die Kassetten (11) quer zur Verschieberichtung des Kassettenschlittens (10) verschiebbar sind, um sie in die Lade- oder Entladeposition zu bringen.3. Apparatus according to claim 1 or 2, characterized in that the cassette carriage (10) can be fitted with a plurality of cassettes (11) arranged next to one another transversely to its direction of displacement, and in that the cassettes (11) can be displaced transversely to the direction of displacement of the cassette carriage (10) to put them in the loading or unloading position. 4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß bei feststehendem Ausgangsmagazin (6) mehrere mit jeweils einem Magazinkanal korrespondierende Kassettenschlitten-Träger (8a) mit Kassettenschlitten (10a) vorgesehen sind.4. Apparatus according to claim 1, characterized in that with a fixed output magazine (6) several with a magazine channel corresponding cassette carriage carrier (8a) with cassette carriage (10a) are provided. 5. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß jede Kassette (11) aus zwei Seitenteilen (44,45) besteht, die durch austauschbare Distanzstücke (46,47) verbunden und mit Schlitzen (50) zum Einführen der Magazinstangen (12) versehen sind, daß die Seitenteile (44,45) verschiebbare Verschlußleisten (48,49) für die Magazinstangen (12) aufweisen, die durch Federn in die Verschlußstellung gedrückt werden, daß am Kassettenschlitten-Träger (8) ein Öffnungselement (37) vorgesehen ist, welches sich beim Verfahren des Kassettenschlittens (10) zwischen die Verschlußleisten (48,49) schiebt und diese auseinanderdrückt, und daß am Kassettenschlitten-Träger (8) ferner eine Verschlußschiene oder -platte (17) vorgesehen ist, die bei geöffneten Verschlußleisten (48,49) ein Aus-bzw. Eintreten von Bauelementen (51) aus bzw. in die Magazinstangen (12) bis auf die zum Ent- bzw. Beladen bestimmte Magazinstange (12) verhindert.5. Device according to one of the preceding claims, characterized in that each cassette (11) consists of two side parts (44, 45) connected by interchangeable spacers (46, 47) and with slots (50) for inserting the magazine rods (12 ) are provided that the side parts (44, 45) have sliding closure strips (48, 49) for the magazine rods (12), which are pressed into the closed position by springs, that an opening element (37) is provided on the cassette carriage support (8) is, which is in the process of Pushes the cassette carriage (10) between the closure strips (48, 49) and pushes them apart, and that a closure rail or plate (17) is also provided on the cassette carriage support (8), which, when the closure strips (48, 49) are open, respectively. Prevents components (51) from entering or entering the magazine bars (12) except for the magazine bar (12) intended for unloading or loading. 6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß an dem Kassettenschlitten-Träger (8) eine Vereinzelungseinrichtung für die aus der ausgewählten Magazinstange (12) austretenden bzw. in diese eintretenden Bauelemente (51) vorgesehen ist.6. Device according to one of the preceding claims, characterized in that on the cassette carriage carrier (8) a separating device for the components (51) emerging from or entering the selected magazine rod (12) is provided. 7. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß am Kassettenschlitten-Träger (8)ein Mundstück (23) vorgesehen ist, welches einen Überführungskanal (28) enthält, der die ausgewählte Magazinstange (12) der Kassette (11) mit dem ausgewählten Magazinkanal des Eingangs- bzw. Ausgangsmagazins (2,6) verbindet.7. Device according to one of the preceding claims, characterized in that on the cassette carriage carrier (8) a mouthpiece (23) is provided which contains a transfer channel (28) which the selected magazine rod (12) of the cassette (11) with the selected magazine channel of the input or output magazine (2,6) connects. 8. Vorrichtung nach Anspruch 6 und 7, dadurch gekennzeichnet, daß die Vereinzelungsvorrichtung aus einem in den Überführungskanal (28) des Mundstücks (23) eingreifenden Förderrad (25) für die Bauelemente (51) besteht, und daß zu der Vereinzelungsvorrichtung ferner eine im Bereich des Überführungskanals (28) vorgesehene Lichtschranke (26,27) gehört.8. Apparatus according to claim 6 and 7, characterized in that the separating device consists of a in the transfer channel (28) of the mouthpiece (23) engaging feed wheel (25) for the components (51), and that further to the separating device in the area of the transfer channel (28) provided light barrier (26, 27). 9. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß an der dem Eingangs- bzw. Ausgangsmagazin (2,6) zugewandten Seite des Mundstücks (23) eine Zunge (29) vorgesehen ist, die zwecks Zentrierung in eine Ausnehmung oder einen Schlitz (52) am Eingangs- bzw. Ausgangsmagazin (2,6) eintaucht.9. Apparatus according to claim 7 or 8, characterized in that a tongue (29) is provided on the side of the mouthpiece (23) facing the input or output magazine (2, 6) which is centered in a recess or a slot (52) at the entrance or Output magazine (2.6) immersed. 10. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Kassettenschlitten-Träger (8) schwenkbar an der Vorrichtung angebracht ist.10. Device according to one of the preceding claims, characterized in that the cassette carriage carrier (8) is pivotally attached to the device. 11. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Kassettenschlitten (10) mit einer Vielzahl von zahnartigen Ausnehmungen oder Schlitzen (34) versehen ist, und daß als Antrieb des Kassettenschlittens (10) ein Exzentertrieb (30) mit zwei Exzenterstiften (31,32) dient, die in benachbarte Ausnehmungen bzw. Schlitze (34) eingreifen, derart, daß bei Drehung des Exzenters (30) jeweils ein Exzenterstift (31,32) in eine Ausnehmung bzw.einen Schlitz (34) eintritt und der andere aus einer Ausnehmung bzw.einem Schlitz (34) austritt.11. Device according to one of the preceding claims, characterized in that the cassette slide (10) is provided with a plurality of tooth-like recesses or slots (34), and that as the drive of the cassette slide (10), an eccentric drive (30) with two eccentric pins ( 31, 32) which engage in adjacent recesses or slots (34), such that when the eccentric (30) rotates, one eccentric pin (31, 32) enters a recess or slot (34) and the other emerges from a recess or a slot (34).
EP86115464A 1985-11-11 1986-11-07 Device for testing and sorting electronic components Expired - Lifetime EP0222344B1 (en)

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AT86115464T ATE68115T1 (en) 1985-11-11 1986-11-07 DEVICE FOR TESTING AND SORTING ELECTRONIC COMPONENTS.

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DE19853539965 DE3539965A1 (en) 1985-11-11 1985-11-11 DEVICE FOR TESTING AND SORTING ELECTRONIC COMPONENTS

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EP0222344A2 true EP0222344A2 (en) 1987-05-20
EP0222344A3 EP0222344A3 (en) 1988-02-03
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Also Published As

Publication number Publication date
EP0222344B1 (en) 1991-10-09
DE3539965A1 (en) 1987-05-14
ATE68115T1 (en) 1991-10-15
EP0222344A3 (en) 1988-02-03
US4778063A (en) 1988-10-18
DE3681877D1 (en) 1991-11-14

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