Web-feed control apparatus

Details Web-feed control apparatus Web-feed control apparatus

1978-04-25

1980-06-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

226 45, G01N 2130

Patent

active

042097088

ABSTRACT:
The feeding of a plurality of material webs to a machine for simultaneous processing of the webs, is controlled by web-feed control apparatus arranged to synchronize feeding of the webs relative to each other. This synchronization is effected by using optical sensors to detect spacing marks along each web and then controlling the rate of advance of each web such that the spacing marks pass the optical sensors simultaneously for all the webs. The rate of web advance may be controlled by selective activation of braking devices or by varying the drive to the advancing means of each web.

REFERENCES:
patent: 3323700 (1967-06-01), Epstein et al.
patent: 3339817 (1967-09-01), French
patent: 3399306 (1968-08-01), Guastavino

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