Device for monitoring wire supply and consumption

Details Device for monitoring wire supply and consumption Device for monitoring wire supply and consumption

1992-05-26

1994-01-11

Seidel, Richard K.

Metal fusion bonding

With means to juxtapose and bond plural workpieces

Wire lead bonder

228 8, B23K 3700

Patent

active

052773540

ABSTRACT:
A device for incorporation in a wire bonding machine for monitoring the supply of wire from a wire supply spool to a bonding wedge. The device includes a mount (12) for rotatably mounting a wire supply spool (1); a guide wheel (7) mounted on a lever (8), which lever (8) can be deflected between a first position to which it is biassed by a spring (10) and a second position at which it activates sensor (A); and a motor (3) for driving the wire supply spool (1), which motor (3) is started by the sensor (A) when the sensor is activated by the lever (8). The device further comprises a means for stopping the motor (3) when a predetermined amount of wire (6) has been supplied. The wire (6) passes over the guide wheel (7) between the wire supply spool (1) and the bonding wedge so that the consumption of wire during a bonding cycle causes deflection of the lever (8) from its first position to its second position. The device makes it possible for the operator of the wire bonding machine to have available information about wire consumption and wire supply, in order to provide improved control of the bonding process.

REFERENCES:
patent: 2223033 (1940-11-01), Friemel
patent: 3454204 (1969-07-01), Fieldgate
patent: 3485426 (1969-12-01), Apicella
patent: 3587959 (1971-06-01), Glover
patent: 4572421 (1986-02-01), Hug et al.
patent: 4696708 (1987-09-01), Keller et al.
patent: 4763826 (1988-08-01), Kulicke et al.

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