Conveyors: power-driven – Conveyor section – Load simultaneously engaged between and moved by a plurality...
Reexamination Certificate
1999-05-03
2001-01-09
Valenza, Joseph E. (Department: 3651)
Conveyors: power-driven
Conveyor section
Load simultaneously engaged between and moved by a plurality...
C198S468200, C198S750110, C414S226020, C414S753100
Reexamination Certificate
active
06170641
ABSTRACT:
The invention relates to an apparatus for transporting thin boards, in particular very thin printed circuit boards, which are held between mutually opposite rows of grippers and are transported through various treatment zones.
U.S. Pat. No. 4,926,789 has disclosed a transport apparatus in which grippers take hold of the opposite, uncoated edges of a printed circuit board, after the grippers have first been opened by an actuating device, in order to receive a printed circuit board. This design is suitable for relatively rigid printed circuit boards which do not sag between the rows of grippers when transported, so that the coating which has been applied to the boards is not damaged. However, if very thin, film-like printed circuit boards are to be transported using such an apparatus, there is a risk of the thin printed circuit board sagging and as a result damaging the coating which has been previously applied by a casting device and is not yet solid.
The invention is based on the object of designing an apparatus of the type mentioned at the outset in such a way that it is suitable even for very thin, film-like printed circuit boards.
According to the invention, this object is achieved by the fact that at least one row of grippers is spring-loaded, so that in the gripping position the printed circuit board is held taut and cannot sag due to the tension applied.
REFERENCES:
patent: 3077259 (1963-02-01), Braun
patent: 3771669 (1973-11-01), Maggioni
patent: 4273507 (1981-06-01), Herdzina et al.
patent: 4621516 (1986-11-01), Schafer et al.
patent: 4785657 (1988-11-01), Votava
patent: 5667351 (1997-09-01), Tokairin et al.
patent: 5707052 (1998-01-01), Adams et al.
patent: 4243252 (1993-07-01), None
patent: 4339092 (1995-05-01), None
Abstract for DE 4339092.
Abstract for DE 4243252.
Crichton David R.
Valenza Joseph E.
Vantico Inc.
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