System for monitoring the operation of a machine for producing b

Details System for monitoring the operation of a machine for producing b System for monitoring the operation of a machine for producing b

1982-01-21

1984-09-25

Spruill, Robert L.

Package making

With means responsive to a sensed condition

Separate delivery of incomplete or defective package

53 65, 53508, B65B 5700, B65B 5718

Patent

active

044729227

ABSTRACT:
A preheated carrier strip of thermoplastic material passes successively through a molding station in which blisters are formed therein, a filling station in which goods to be packaged are introduced into these blisters, a sealing station in which a metallic cover strip is fused onto the carrier strip for hermetically closing the filled blisters, and a cutting station in which the resulting composite tape is divided into individual packages each having one or more rows of blisters. The tape is positively entrained by the two transport rollers, which have peripheral indentations engaged by its blisters, and forms a loop of variable length between these rollers to allow for their instantaneous speed differences. A first photodetector scans the carrier strip between the filling and sealing stations and, on sensing an empty blister, causes the actuation of a perforator punching a hole into a part of the cover strip subsequently coming to overlie the incompletely filled row of blisters. An error pulse simultaneously loaded into a shift register actuates, after a suitable delay, a sorter downstream of the cutting station to eliminate the defective package from the regular machine output. A resulting control pulse, read out from an earlier stage of the shift register, causes the generation of an alarm signal if it does not coincide with a reference pulse from a second photodetector positioned to sense the punched hole between the downstream transport roller and the cutting station.

REFERENCES:
patent: 3238691 (1966-03-01), Miller et al.
patent: 3445981 (1969-05-01), Tatsu Hori
patent: 3889447 (1975-06-01), Garris

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