Metal working – Means to assemble or disassemble – Means to assemble electrical device
Patent
1986-03-04
1987-06-09
Hall, Carl E.
Metal working
Means to assemble or disassemble
Means to assemble electrical device
29759, 226 76, 226156, H05K 330
Patent
active
046709762
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cassette magazine for a component mounting machine for mounting chip-type electronic components on a substrate and where the components are delivered in reels of tape.
Surface mounted electronic components are small, for instance in the size of 2.times.1.25.times.0.5 millimeters and this gives rise to a number of practical consequences for the mounting operation. The components can only be mounted by hand with great difficulty which means, that there is a great demand for automatic mounting machines even at small production quantities.
Surface mounted components are often delivered in so-called blister tapes which have a width of 8, or in certain cases, 12 or 16 millimeters and are provided with a cavity for each component. By delivering the components in a reel they will also be easy to handle in distribution and in the factory. They will also be relatively easy to handle in the pick and place machine.
Instead of reels the components can be fed to the pick and mounting member of the machine by means of vibrators. Other magazines can be made in the form of pipes in which the components are stacked but reels and vibrators are predominant.
With the word component feeder is meant a device which feeds a component to a certain predecided picking point where it can be fetched by a picking head. The component feeders in today's machines therefore comprise a feeding device for blister tapes or a vibrator.
In existing mounting machines problems often arise due to the fact that the feeding of the components does not operate satisfactorily. The machines are therefore often provided with a so-called refire function which means, that the machine tries again if it does not get hold of the component at the first trial. After three trials the machine stops and calls for the operator. This will in fact occur often in many cases. Actually, many machines are said to operate with half or a quarter of the capacity they would have had if they had operated continuously. Every error in a component magazine will cause the machine to stop until the operator has succeeded in finding and remedying the error.
Another problem with the mounting machines used today is the demand to reload the magazine when a new type of circuit card is to be mounted. Since this type of card normally comprises other components the contents of the magazine often has to be changed. In order to keep the store costs low, many enterprises want to manufacture short series of certain card types, for instance of five or sometimes only one card which will drastically lower production capacity.
The problems mentioned above have been considerably reduced in a machine according to the invention as defined in the characterizing clause of the main claim. An embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which
FIG. 1a shows a perspective and FIG. 1b depicts a plan view of a blister tape,
FIG. 2 is a sectional sideview of the cassette magazine of the machine according to the invention,
FIG. 3 is a view from above of the machine according to FIG. 2,
FIG. 4 is a sideview of the feeding and expelling mechanism of the machine according to the invention, and
FIG. 5 is a partly cut-out view of the machine according to FIG. 4.
The problem of sudden stops due to operational disturbances in a component feeder can be considerably reduced by building together a number of the feeding means for cassettes and by designing the machine so that the cassettes can be exchanged while the machine is in operation.
When a fault is discovered in a feeding device the attention of the operator is called for by alarm in the usual way. However, the machine does not stop and wait for the operator but can continue to mount components taken from other cassettes. Normally, there are a number of components in the other cassettes which should be mounted on the same card. When the machine is occupied therewith the operator has time to take out the deficient cassette, correct the deficiency and reload the
REFERENCES:
patent: 4174567 (1979-11-01), Kamoshida et al.
patent: 4393579 (1983-07-01), Van Hooreweder
patent: 4610083 (1986-09-01), Campisi et al.
Rodin Gunnar
Stridsberg Lennart
Hall Carl E.
Mydata Automation AB
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