Feather light web edge sensor

Details Feather light web edge sensor Feather light web edge sensor

1988-05-06

1989-08-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250561, 33 1PT, 200 6113, G01N 2186

Patent

active

048598607

ABSTRACT:
A web sensor for sensing the edge of a web in a feather like action is disclosed which includes a feeler (10) carried by rotary disk (12) which fits into a pair of housing sections (20, 24) and is coupled to the housing by means of weighted balls (32, 34, 36). The weighted balls are carried in a circumferential slot (42) with a clearance (44). The weighted balls extend into arcuate slots (38, 40) in the housing sections and dampen rapid oscillations in the pendular motion of feeler (10). Turning of rotary disk (12) interrupts a pair of energy beams which may be light (50A, 52A) or an air jet (124, 126). Depending upon which energy beam is interrupted, the web is moved accordingly until feeler (10) resumes its neutral position.

REFERENCES:
patent: 2448639 (1948-09-01), Wachsman
patent: 3307041 (1967-02-01), Kling
patent: 3569642 (1971-03-01), Grover
patent: 3873789 (1975-03-01), Ward
patent: 4077579 (1978-03-01), Seleski et al.
patent: 4153998 (1979-05-01), McMurtry
patent: 4303189 (1981-12-01), Wiley et al.
patent: 4728800 (1988-03-01), Surka
patent: 4809188 (1989-02-01), Willits et al.

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