Method and devices for regulation of the forward travel of a str

Details Method and devices for regulation of the forward travel of a str Method and devices for regulation of the forward travel of a str

1979-10-16

1981-10-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

226 45, 250557, G01N 2186

Patent

active

042937744

ABSTRACT:
In a wrapping machine a strip bearing repetitively markings and marks is cut up into sections for individual wrapping of articles such as slabs of chocolate.
It is desirable to have available a correction in both directions, which is accurate over a wide margin, to avoid restrictions on the printing of the strip, and to allow continuous forward travel and a high rhythm.
Circuits (100-120) validate a mark detection signal (LECTREP) while eliminating interference and irrelevant signals and evaluate the phase shifts between this signal (LECTREP) and a synchronization signal (SYNCHR) depending upon the machine. They establish a correction limited to a certain maximum. The correction acts upon a motor (1) which drives the strip. The maximum is such that the cut section remains usable, which avoids interruption, and leaves an article wrapped in this defective section for later elimination.

REFERENCES:
patent: 3861983 (1975-01-01), Harrell
patent: 4209708 (1980-06-01), Sestini

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